diff --git a/framework-dotnet/src/lib/MBS.Core/Application.cs b/framework-dotnet/src/lib/MBS.Core/Application.cs
index 6773ebe..85822ed 100644
--- a/framework-dotnet/src/lib/MBS.Core/Application.cs
+++ b/framework-dotnet/src/lib/MBS.Core/Application.cs
@@ -1,4 +1,5 @@
 using System.ComponentModel;
+using MBS.Core.Extensibility;
 
 namespace MBS.Core;
 
@@ -492,4 +493,12 @@ public class Application
 		return true;
 	}
 
+	internal void _EnableDisableCommand(Command command, bool enable)
+	{
+	}
+
+    protected internal virtual Plugin[] GetAdditionalPlugins()
+    {
+		return new Plugin[0];
+    }
 }
diff --git a/framework-dotnet/src/lib/MBS.Core/Command.cs b/framework-dotnet/src/lib/MBS.Core/Command.cs
new file mode 100644
index 0000000..c838887
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Command.cs
@@ -0,0 +1,149 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core;
+
+public class Command
+{
+	public class CommandCollection
+		: System.Collections.ObjectModel.Collection<Command>
+	{
+		public Command this[string ID]
+		{
+			get
+			{
+				foreach (Command command in this)
+				{
+					if (command.ID == ID) return command;
+				}
+				return null;
+			}
+		}
+	}
+
+	public Command()
+	{
+	}
+	public Command(string id, string title, CommandItem[] items = null)
+	{
+		ID = id;
+		Title = title;
+		if (items != null)
+		{
+			for (int i = 0; i < items.Length; i++)
+			{
+				Items.Add(items[i]);
+			}
+		}
+	}
+	/// <summary>
+	/// Determines whether this command displays as checked.
+	/// </summary>
+	public bool Checked { get; set; } = false;
+	/// <summary>
+	/// The ID of the command, used to reference it in <see cref="CommandReferenceCommandItem"/>.
+	/// </summary>
+	public string ID { get; set; } = String.Empty;
+	/// <summary>
+	/// The title of the command (including mnemonic prefix, if applicable).
+	/// </summary>
+	public string Title { get; set; } = String.Empty;
+
+	private string mvarDefaultCommandID = String.Empty;
+	public string DefaultCommandID { get { return mvarDefaultCommandID; } set { mvarDefaultCommandID = value; } }
+
+	/// <summary>
+	/// A <see cref="StockType"/> that represents a predefined, platform-themed command.
+	/// </summary>
+	public StockType StockType { get; set; } = StockType.None;
+
+	private string mvarImageFileName = String.Empty;
+	/// <summary>
+	/// The file name of the image to be displayed on the command.
+	/// </summary>
+	public string ImageFileName { get { return mvarImageFileName; } set { mvarImageFileName = value; } }
+
+
+	/// <summary>
+	/// The child <see cref="CommandItem"/>s that are contained within this <see cref="Command"/>.
+	/// </summary>
+	public CommandItem.CommandItemCollection Items { get; } = new CommandItem.CommandItemCollection();
+
+	/// <summary>
+	/// The event that is fired when the command is executed.
+	/// </summary>
+	public event EventHandler Executed;
+
+	/// <summary>
+	/// Determines whether this <see cref="Command" /> is enabled in all <see cref="CommandBar" />s and <see cref="MenuBar" />s
+	/// that reference it.
+	/// </summary>
+	/// <value><c>true</c> if visible; otherwise, <c>false</c>.</value>
+	private bool _Enabled = true;
+	public bool Enabled { get { return _Enabled; } set { _Enabled = value; Application.Instance._EnableDisableCommand(this, value); } }
+
+	/// <summary>
+	/// Determines whether this <see cref="Command" /> is visible in all <see cref="CommandBar" />s and <see cref="MenuBar" />s
+	/// that reference it.
+	/// </summary>
+	/// <value><c>true</c> if visible; otherwise, <c>false</c>.</value>
+	public bool Visible { get; set; }
+
+	/// <summary>
+	/// Executes this <see cref="Command"/>.
+	/// </summary>
+	[Obsolete("Please use Application.ExecuteCommand. Command.Execute does not always work and will be removed in a future release.")]
+	public void Execute()
+	{
+		if (Executed != null) Executed(this, EventArgs.Empty);
+	}
+
+	public override string ToString()
+	{
+		return String.Format("{0} [{1}]", ID, Title);
+	}
+
+	private Dictionary<string, object> _extraData = new Dictionary<string, object>();
+	public T GetExtraData<T>(string key, T defaultValue = default(T))
+	{
+		if (_extraData.ContainsKey(key))
+		{
+			if (_extraData[key] is T)
+			{
+				return (T)_extraData[key];
+			}
+		}
+		return defaultValue;
+	}
+
+	public void SetExtraData<T>(string key, T value)
+	{
+		_extraData[key] = value;
+	}
+
+	public object GetExtraData(string key, object defaultValue = null)
+	{
+		if (_extraData.ContainsKey(key))
+			return _extraData[key];
+		return defaultValue;
+	}
+
+	public void SetExtraData(string key, object value)
+	{
+		_extraData[key] = value;
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/CommandEventArgs.cs b/framework-dotnet/src/lib/MBS.Core/CommandEventArgs.cs
new file mode 100644
index 0000000..a1c1b27
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/CommandEventArgs.cs
@@ -0,0 +1,50 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core;
+
+public class CommandEventArgs : EventArgs
+{
+	public Command Command { get; private set; }
+
+	private Dictionary<string, object> _NamedParameters = new Dictionary<string, object>();
+	public T GetNamedParameter<T>(string key, T defaultValue = default(T))
+	{
+		if (_NamedParameters.ContainsKey(key))
+			return (T)_NamedParameters[key];
+		return defaultValue;
+	}
+	public object GetNamedParameter(string key, object defaultValue = null)
+	{
+		if (_NamedParameters.ContainsKey(key))
+			return _NamedParameters[key];
+		return defaultValue;
+	}
+
+
+	public CommandEventArgs(Command command, KeyValuePair<string, object>[] namedParameters = null)
+	{
+		Command = command;
+		if (namedParameters != null)
+		{
+			for (int i = 0; i < namedParameters.Length; i++)
+			{
+				_NamedParameters[namedParameters[i].Key] = namedParameters[i].Value;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/CommandItem.cs b/framework-dotnet/src/lib/MBS.Core/CommandItem.cs
new file mode 100644
index 0000000..a259a2f
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/CommandItem.cs
@@ -0,0 +1,93 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of Mocha.NET.
+// 
+// Mocha.NET is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Mocha.NET is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Mocha.NET.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core;
+
+public abstract class CommandItem
+{
+	public string InsertAfterID { get; set; } = null;
+	public string InsertBeforeID { get; set; } = null;
+
+	public class CommandItemCollection
+		: System.Collections.ObjectModel.Collection<CommandItem>
+	{
+		public int IndexOf(string value)
+		{
+			for (int i = 0; i < Count; i++)
+			{
+				if (this[i] is CommandReferenceCommandItem)
+				{
+					if ((this[i] as CommandReferenceCommandItem).CommandID.Equals(value))
+						return i;
+				}
+			}
+			return -1;
+		}
+	}
+}
+public class ActionCommandItem : CommandItem
+{
+	public string ID { get; }
+	public string Title { get; }
+
+	public event EventHandler Executed;
+
+	public void Execute()
+	{
+		Executed?.Invoke(this, EventArgs.Empty);
+	}
+
+	public ActionCommandItem(string id, string title, EventHandler execute = null)
+	{
+		ID = id;
+		Title = title;
+		if (execute != null)
+		{
+			Executed += execute;
+		}
+	}
+}
+public class CommandReferenceCommandItem : CommandItem
+{
+	private string mvarCommandID = String.Empty;
+	public string CommandID { get { return mvarCommandID; } set { mvarCommandID = value; } }
+
+	public CommandReferenceCommandItem()
+	{
+	}
+	public CommandReferenceCommandItem(string commandID)
+	{
+		mvarCommandID = commandID;
+	}
+}
+public class CommandPlaceholderCommandItem : CommandItem
+{
+	private string mvarPlaceholderID = String.Empty;
+	public string PlaceholderID { get { return mvarPlaceholderID; } set { mvarPlaceholderID = value; } }
+
+	public CommandPlaceholderCommandItem(string placeholderID)
+	{
+		mvarPlaceholderID = placeholderID;
+	}
+}
+public class SeparatorCommandItem : CommandItem
+{
+}
+public class GroupCommandItem : CommandItem
+{
+	public CommandItemCollection Items { get; } = new CommandItemCollection();
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/Context.cs b/framework-dotnet/src/lib/MBS.Core/Context.cs
new file mode 100644
index 0000000..4394f02
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Context.cs
@@ -0,0 +1,115 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of Mocha.NET.
+// 
+// Mocha.NET is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Mocha.NET is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Mocha.NET.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core;
+
+public class Context
+{
+	public class ContextCollection
+		: System.Collections.ObjectModel.Collection<Context>
+	{
+		private Dictionary<Guid, Context> _ItemsByID = new Dictionary<Guid, Context>();
+
+		public bool Contains(Guid contextID)
+		{
+			return _ItemsByID.ContainsKey(contextID);
+		}
+
+		public Context this[Guid id]
+		{
+			get
+			{
+				if (_ItemsByID.ContainsKey(id))
+					return _ItemsByID[id];
+				return null;
+			}
+		}
+
+		protected override void ClearItems()
+		{
+			base.ClearItems();
+			_ItemsByID.Clear();
+		}
+		protected override void InsertItem(int index, Context item)
+		{
+			base.InsertItem(index, item);
+			_ItemsByID[item.ID] = item;
+		}
+		protected override void RemoveItem(int index)
+		{
+			_ItemsByID.Remove(this[index].ID);
+			base.RemoveItem(index);
+		}
+	}
+
+	public Guid ID { get; private set; } = Guid.Empty;
+	public string Name { get; private set; } = String.Empty;
+
+	// public MenuBar MenuBar { get; } = new MenuBar();
+	public Command.CommandCollection Commands { get; } = new Command.CommandCollection();
+
+	public Context(Guid id, string name)
+	{
+		ID = id;
+		Name = name;
+	}
+
+	public override string ToString()
+	{
+		return String.Format("{0}     {1}", Name, ID);
+	}
+
+	private Dictionary<string, List<EventHandler>> _CommandEventHandlers = new Dictionary<string, List<EventHandler>>();
+	/// <summary>
+	/// Attachs an event handler for the command with the ID specified by <paramref name="commandID" />.
+	/// </summary>
+	/// <returns><c>true</c>, if command event handler was attached, <c>false</c> otherwise.</returns>
+	/// <param name="commandID">The ID of the <see cref="Command" /> for which to attach an event handler.</param>
+	/// <param name="handler">The event handler to invoke when the <see cref="Command" /> is executed.</param>
+	public bool AttachCommandEventHandler(string commandID, EventHandler handler)
+	{
+		// handle command event handlers attached without a Command instance
+		if (!_CommandEventHandlers.ContainsKey(commandID))
+		{
+			_CommandEventHandlers.Add(commandID, new List<EventHandler>());
+		}
+		if (!_CommandEventHandlers[commandID].Contains(handler))
+		{
+			_CommandEventHandlers[commandID].Add(handler);
+			return true;
+		}
+		return false;
+	}
+	/// <summary>
+	/// Executes the command (i.e., calls all attached <see cref="EventHandler" />s for the <see cref="Command" />) with
+	/// the given <paramref name="commandID" />, passing in the given parameters in an instance of <see cref="CommandEventArgs" />.
+	/// </summary>
+	/// <returns><c>true</c>, if command was executed, <c>false</c> otherwise.</returns>
+	/// <param name="commandID">Command identifier.</param>
+	/// <param name="namedParameters">Named parameters.</param>
+	public bool ExecuteCommand(string commandID, KeyValuePair<string, object>[] namedParameters = null)
+	{
+		if (_CommandEventHandlers.ContainsKey(commandID))
+		{
+			for (int i = 0; i < _CommandEventHandlers[commandID].Count; i++)
+			{
+				_CommandEventHandlers[commandID][i](this, new CommandEventArgs(Commands[commandID], namedParameters));
+			}
+		}
+		return false;
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/Extensibility/Feature.cs b/framework-dotnet/src/lib/MBS.Core/Extensibility/Feature.cs
new file mode 100644
index 0000000..50c802b
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Extensibility/Feature.cs
@@ -0,0 +1,61 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core.Extensibility;
+
+public class Feature
+{
+	public class FeatureCollection
+		: System.Collections.ObjectModel.Collection<Feature>
+	{
+	}
+
+	public Guid ID { get; private set; } = Guid.Empty;
+	public string Title { get; private set; } = null;
+
+	public Feature(Guid id, string title)
+	{
+		ID = id;
+		Title = title;
+	}
+
+	public override bool Equals(object obj)
+	{
+		if (!(this is null) && (obj is null)) return false;
+		if (this is null && !(obj is null)) return false;
+
+		if (obj is Feature)
+		{
+			Feature feat = (obj as Feature);
+			return feat.ID.Equals(ID);
+		}
+		return base.Equals(obj);
+	}
+	public override int GetHashCode()
+	{
+		return base.GetHashCode();
+	}
+
+	public static bool operator ==(Feature left, Feature right)
+	{
+		return (left.ID == right.ID);
+	}
+	public static bool operator !=(Feature left, Feature right)
+	{
+		return (left.ID != right.ID);
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/Extensibility/Plugin.cs b/framework-dotnet/src/lib/MBS.Core/Extensibility/Plugin.cs
new file mode 100644
index 0000000..c82f5cb
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Extensibility/Plugin.cs
@@ -0,0 +1,175 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core.Extensibility;
+
+public class Plugin
+{
+	public Context Context { get; protected set; }
+	public virtual string Title { get; set; } = null;
+	public Feature.FeatureCollection ProvidedFeatures { get; } = new Feature.FeatureCollection();
+
+	/// <summary>
+	/// Gets a <see cref="PropertyBag" /> containing the plugin-specific
+	/// settings for this <see cref="Plugin" />.
+	/// </summary>
+	/// <value>The settings.</value>
+	public PropertyBag Settings { get; }
+
+	public Plugin()
+	{
+		Settings = new PluginPropertyBag(this);
+	}
+
+	public bool Initialized { get; private set; } = false;
+	public void Initialize()
+	{
+		if (Initialized)
+			return;
+
+		InitializeInternal();
+
+		Settings.Initialize();
+		Initialized = true;
+	}
+
+	public Guid ID { get; set; } = Guid.Empty;
+
+	protected virtual void InitializeInternal()
+	{
+		// this method intentionally left blank
+	}
+
+	protected virtual bool AutoRegister => true;
+
+	protected virtual bool IsSupportedInternal()
+	{
+		return true;
+	}
+	public bool IsSupported()
+	{
+		return IsSupportedInternal();
+	}
+	private static Plugin[] _plugins = null;
+	public static TPlugin[] Get<TPlugin>(bool resetCache = false) where TPlugin : Plugin
+	{
+		Plugin[] plugins = Get(resetCache);
+		return plugins.OfType<TPlugin>().ToArray();
+	}
+	public static Plugin[] Get(bool resetCache = false)
+	{
+		if (resetCache)
+		{
+			_plugins = null; // should not be cached? // actually, yes it should...
+
+			// 2020-12-12 20:54 by beckermj
+			// ACTUALLY, it depends on whether the configuration needs to be persisted across calls to Get()
+			// 				[it does] and whether the list of plugins needs to be reloaded when CustomPlugins is modified
+			//				[it shouldn't, but it does] .
+			//
+			// The safest way we can handle this RIGHT NOW is to prevent any plugin from being loaded until after CustomPlugins
+			// is initialized by UIApplication.
+			//
+			// We call Plugins.Get(new Feature[] { KnownFeatures.UWTPlatform }) to retrieve the available User Interface plugins
+			// that supply the UWT Platform implementation (e.g. GTK, Windows Forms, etc.) - and this causes CustomPlugins to not
+			// load properly since it loads AFTER this initial call to Plugins.Get().
+			//
+			// So I add ed a resetCache parameter that when specified TRUE will clear the cache and then return the appropriate
+			// plugin. This way we can continue caching future calls to Get() without missing out on CustomPlugins.
+		}
+
+		if (_plugins == null)
+		{
+			Type[] types = Reflection.TypeLoader.GetAvailableTypes(new Type[] { typeof(Plugin) });
+			System.Collections.Generic.List<Plugin> plugins = new System.Collections.Generic.List<Plugin>();
+			for (int i = 0; i < types.Length; i++)
+			{
+				try
+				{
+					/*
+					if (types[i].IsSubclassOf(typeof(ICustomPlugin)))
+					{
+						continue;
+					}
+					*/
+
+					Plugin plg = (Plugin)types[i].Assembly.CreateInstance(types[i].FullName);
+					plugins.Add(plg);
+				}
+				catch (Exception ex)
+				{
+				}
+			}
+
+			Plugin[] plugins2 = Application.Instance.GetAdditionalPlugins();
+			for (int i = 0; i < plugins2.Length; i++)
+			{
+				plugins.Add(plugins2[i]);
+			}
+			_plugins = plugins.ToArray();
+
+			if (resetCache)
+			{
+				_plugins = null;
+				return plugins.ToArray();
+			}
+		}
+		return _plugins;
+	}
+
+	public static TPlugin[] Get<TPlugin>(Feature[] providedFeatures, bool resetCache = false) where TPlugin : Plugin
+	{
+		Plugin[] plugins = Get(providedFeatures, resetCache);
+		return plugins.OfType<TPlugin>().ToArray();
+	}
+	public static Plugin[] Get(Feature[] providedFeatures, bool resetCache = false)
+	{
+		System.Collections.Generic.List<Plugin> list = new System.Collections.Generic.List<Plugin>();
+		Plugin[] plugins = Get(resetCache);
+		for (int i = 0; i < plugins.Length; i++)
+		{
+			if (!plugins[i].AutoRegister)
+				continue;
+
+			if (!plugins[i].IsSupported())
+				continue;
+
+			for (int j = 0; j < providedFeatures.Length; j++)
+			{
+				if (plugins[i].ProvidedFeatures.Contains(providedFeatures[j]))
+					list.Add(plugins[i]);
+			}
+		}
+		return list.ToArray();
+	}
+
+	public static TPlugin Get<TPlugin>(Guid id) where TPlugin : Plugin
+	{
+		Plugin plugin = Get(id);
+		return (TPlugin)plugin;
+	}
+	public static Plugin Get(Guid id)
+	{
+		Plugin[] plugins = Get();
+		for (int i = 0; i < plugins.Length; i++)
+		{
+			if (plugins[i].ID == id)
+				return plugins[i];
+		}
+		return null;
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/Extensibility/PluginPropertyBag.cs b/framework-dotnet/src/lib/MBS.Core/Extensibility/PluginPropertyBag.cs
new file mode 100644
index 0000000..c4a8b11
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Extensibility/PluginPropertyBag.cs
@@ -0,0 +1,49 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core.Extensibility;
+
+
+public class PluginPropertyBag : PropertyBag
+{
+	private Plugin Plugin { get; }
+
+	protected override void OnInitialized(EventArgs e)
+	{
+		base.OnInitialized(e);
+
+		string[] paths = Application.Instance.EnumerateDataPaths();
+		foreach (string datapath in paths)
+		{
+			string path = String.Format("{0}/plugins/{1}/config.xml", datapath, this.Plugin.ID.ToString("b"));
+			if (System.IO.File.Exists(path))
+			{
+				Console.WriteLine("found config in {0}", path);
+			}
+		}
+	}
+
+	internal PluginPropertyBag(Plugin plugin)
+	{
+		Plugin = plugin;
+	}
+
+	protected override void OnPropertyValueRequested<T>(PropertyValueRequestedEventArgs<T> e)
+	{
+		base.OnPropertyValueRequested(e);
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/Extensibility/PropertyBag.cs b/framework-dotnet/src/lib/MBS.Core/Extensibility/PropertyBag.cs
new file mode 100644
index 0000000..db7ae3e
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/Extensibility/PropertyBag.cs
@@ -0,0 +1,187 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core.Extensibility;
+
+public class PropertyValueRequestedEventArgs : EventArgs
+{
+	public Guid ID { get; }
+	public object Value { get; set; }
+
+	public bool Cache { get; set; } = true;
+	public bool Handled { get; set; } = false;
+
+	public PropertyValueRequestedEventArgs(Guid id, object value)
+	{
+		ID = id;
+		Value = value;
+	}
+}
+public class PropertyValueRequestedEventArgs<T> : PropertyValueRequestedEventArgs
+{
+	public new T Value { get { return (T)base.Value; } set { base.Value = value; } }
+
+	public PropertyValueRequestedEventArgs(Guid id, T value) : base(id, value)
+	{
+	}
+}
+
+public class PropertyValueChangingEventArgs : System.ComponentModel.CancelEventArgs
+{
+	public Guid ID { get; }
+	public object OldValue { get; }
+	public object NewValue { get; set; }
+
+	public PropertyValueChangingEventArgs(Guid id, object oldValue, object newValue)
+	{
+		ID = id;
+		OldValue = oldValue;
+		NewValue = newValue;
+	}
+}
+public class PropertyValueChangedEventArgs : EventArgs
+{
+	public Guid ID { get; }
+	public object OldValue { get; }
+	public object NewValue { get; }
+
+	public PropertyValueChangedEventArgs(Guid id, object oldValue, object newValue)
+	{
+		ID = id;
+		OldValue = oldValue;
+		NewValue = newValue;
+	}
+}
+
+public class PropertyBag
+{
+	private Dictionary<Guid, object> _settings = new Dictionary<Guid, object>();
+	private Dictionary<Guid, string> _names = new Dictionary<Guid, string>();
+	public string GetName(Guid id)
+	{
+		if (_names.ContainsKey(id))
+			return _names[id];
+		return null;
+	}
+	public void SetName(Guid id, string name)
+	{
+		_names[id] = name;
+	}
+
+	private Dictionary<Guid, object> _PropertyValues = new Dictionary<Guid, object>();
+	public bool Contains(Guid id)
+	{
+		return _PropertyValues.ContainsKey(id);
+	}
+	public bool SetValue<T>(Guid id, T value)
+	{
+		bool changed = false;
+		lock (_PropertyValues)
+		{
+			object oldValue = null;
+			if (!_PropertyValues.ContainsKey(id) || (!(
+					(_PropertyValues[id] == null && (value as object) == null) ||
+					(_PropertyValues[id] != null && _PropertyValues[id].Equals(value)))))
+			{
+				changed = true;
+			}
+			if (_PropertyValues.ContainsKey(id))
+			{
+				oldValue = _PropertyValues[id];
+			}
+
+			if (changed)
+			{
+				PropertyValueChangingEventArgs e = new PropertyValueChangingEventArgs(id, oldValue, value);
+				OnPropertyValueChanging(e);
+				if (e.Cancel)
+				{
+					return false;
+				}
+			}
+			_PropertyValues[id] = value;
+			if (changed)
+			{
+				OnPropertyValueChanged(new PropertyValueChangedEventArgs(id, oldValue, value));
+			}
+		}
+		return changed;
+	}
+
+	public event EventHandler<PropertyValueChangingEventArgs> PropertyValueChanging;
+	protected virtual void OnPropertyValueChanging(PropertyValueChangingEventArgs e)
+	{
+		PropertyValueChanging?.Invoke(this, e);
+	}
+	public event EventHandler<PropertyValueChangedEventArgs> PropertyValueChanged;
+	protected virtual void OnPropertyValueChanged(PropertyValueChangedEventArgs e)
+	{
+		PropertyValueChanged?.Invoke(this, e);
+	}
+
+	public T GetValue<T>(Guid id, T defaultValue = default(T))
+	{
+		lock (_PropertyValues)
+		{
+			if (_PropertyValues.ContainsKey(id))
+			{
+				if (_PropertyValues[id] is T val)
+				{
+					return val;
+				}
+			}
+			else
+			{
+				PropertyValueRequestedEventArgs<T> e = new PropertyValueRequestedEventArgs<T>(id, defaultValue);
+				OnPropertyValueRequested(e);
+				if (e.Handled)
+				{
+					if (e.Cache)
+					{
+						_PropertyValues[id] = e.Value;
+					}
+					return e.Value;
+				}
+			}
+		}
+		return defaultValue;
+	}
+
+	public event EventHandler<PropertyValueRequestedEventArgs> PropertyValueRequested;
+	protected virtual void OnPropertyValueRequested<T>(PropertyValueRequestedEventArgs<T> e)
+	{
+		PropertyValueRequested?.Invoke(this, e);
+	}
+
+	public IEnumerable<KeyValuePair<Guid, object>> GetAll()
+	{
+		return _PropertyValues;
+	}
+
+	public bool Initialized { get; private set; } = false;
+	protected virtual void OnInitialized(EventArgs e)
+	{
+	}
+	public void Initialize()
+	{
+		if (Initialized)
+			return;
+
+		OnInitialized(EventArgs.Empty);
+		Initialized = true;
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/IO/DirectoryExtensions.cs b/framework-dotnet/src/lib/MBS.Core/IO/DirectoryExtensions.cs
new file mode 100644
index 0000000..fdc496b
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/IO/DirectoryExtensions.cs
@@ -0,0 +1,35 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of Mocha.NET.
+// 
+// Mocha.NET is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// Mocha.NET is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with Mocha.NET.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core.IO;
+
+public static class DirectoryExtensions
+{
+	public static string[] GetFiles(string path, string[] searchPatterns, SearchOption options)
+	{
+		string[] result = new string[0];
+		int j = 0;
+		foreach (string ext in searchPatterns)
+		{
+			string[] filenames = Directory.GetFiles(path, ext, options);
+			Array.Resize<string>(ref result, result.Length + filenames.Length);
+			Array.Copy(filenames, 0, result, j, filenames.Length);
+			j += filenames.Length;
+		}
+		return result;
+	}
+}
\ No newline at end of file
diff --git a/framework-dotnet/src/lib/MBS.Core/StockType.cs b/framework-dotnet/src/lib/MBS.Core/StockType.cs
new file mode 100644
index 0000000..9f36272
--- /dev/null
+++ b/framework-dotnet/src/lib/MBS.Core/StockType.cs
@@ -0,0 +1,137 @@
+// Copyright (C) 2024 Michael Becker  <alcexhim@gmail.com>
+// 
+// This file is part of MBS Framework for .NET Core.
+// 
+// MBS Framework for .NET Core is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// MBS Framework for .NET Core is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with MBS Framework for .NET Core.  If not, see <https://www.gnu.org/licenses/>.
+
+namespace MBS.Core;
+
+public enum StockType
+{
+	None,
+	About,
+	Add,
+	Apply,
+
+	// these four do not have gtk-stock equivalents
+	ArrowDown,
+	ArrowLeft,
+	ArrowRight,
+	ArrowUp,
+
+	Bold,
+	Bookmarks,
+	Cancel,
+	CapsLockWarning,			// not for buttons
+	CDROM,
+	Clear,
+	Close,
+	ColorPicker,				// not for buttons
+	Connect,
+	Convert,
+	Copy,
+	Cut,
+	Delete,
+	DialogAuthentication,		// not for buttons
+	DialogInfo,
+	DialogWarning,
+	DialogError,
+	DialogQuestion,
+	Directory,					// not for buttons
+	Discard,
+	Disconnect,
+	DragAndDrop,				// not for buttons
+	DragAndDropMultiple,		// not for buttons
+	Edit,
+	Execute,
+	File,
+	Find,
+	FindAndReplace,
+	Floppy,
+	Folder,
+	Fullscreen,
+	GotoBottom,
+	GotoFirst,
+	GotoLast,
+	GotoTop,
+	GoBack,
+	GoDown,
+	GoForward,
+	GoUp,
+	HardDisk,
+	Help,
+	Home,
+	Index,
+	Indent,
+	Info,
+	Italic,
+	JumpTo,
+	JustifyCenter,
+	JustifyFill,
+	JustifyLeft,
+	JustifyRight,
+	LeaveFullscreen,
+	MissingImage,				// not for buttons
+	MediaForward,
+	MediaNext,
+	MediaPause,
+	MediaPlay,
+	MediaPrevious,
+	MediaRecord,
+	MediaRewind,
+	MediaStop,
+	Network,
+	New,
+	No,
+	OK,
+	Open,
+	OrientationPortrait,
+	OrientationLandscape,
+	OrientationReverseLandscape,
+	OrientationReversePortrait,
+	PageSetup,
+	Paste,
+	Preferences,
+	Print,
+	PrintError,					// not for buttons
+	PrintPaused,				// not for buttons
+	PrintPreview,
+	PrintReport,				// not for buttons
+	PrintWarning,				// not for buttons
+	Properties,
+	Quit,
+	Redo,
+	Refresh,
+	Remove,
+	RevertToSaved,
+	Save,
+	SaveAs,
+	SelectAll,
+	SelectColor,
+	SelectFont,
+	SortAscending,
+	SortDescending,
+	SpellCheck,
+	Stop,
+	Strikethrough,
+	Undelete,
+	Underline,
+	Undo,
+	Unindent,
+	Yes,
+	Zoom100,
+	ZoomFit,
+	ZoomIn,
+	ZoomOut
+}
\ No newline at end of file