diff --git a/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupContainerElement.cs b/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupContainerElement.cs
index 4b8d66a4..bcab359f 100644
--- a/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupContainerElement.cs
+++ b/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupContainerElement.cs
@@ -132,7 +132,7 @@ namespace UniversalEditor.ObjectModels.Markup
 					if (attID != null) id = attID.Value;
 				}
 
-                if (Elements.Contains(el1.FullName, id))
+                if (Elements.Contains(el1.FullName, id, (el1 is MarkupTagElement ? (el1 as MarkupTagElement).Attributes : null)))
                 {
                     Elements[el1.FullName].Combine(el1);
                 }
diff --git a/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupElement.cs b/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupElement.cs
index 673c56de..10c83038 100644
--- a/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupElement.cs
+++ b/CSharp/Libraries/UniversalEditor.Essential/ObjectModels/Markup/MarkupElement.cs
@@ -82,7 +82,7 @@ namespace UniversalEditor.ObjectModels.Markup
 				item.ParentObjectModel = this._parentObjectModel;
 				base.Add(item);
 			}
-			public bool Contains(string fullName, string id = null)
+			public bool Contains(string fullName, string id = null, MarkupAttribute.MarkupAttributeCollection attributes = null)
 			{
 				MarkupElement el = this[fullName];
 				MarkupTagElement tag = (el as MarkupTagElement);
@@ -92,6 +92,18 @@ namespace UniversalEditor.ObjectModels.Markup
 					MarkupAttribute attID = tag.Attributes["ID"];
 					if (attID != null) retval &= (id == attID.Value);
 				}
+
+				if (tag != null && attributes != null)
+				{
+					for (int i = 0; i < attributes.Count; i++)
+					{
+						MarkupAttribute att = tag.Attributes[attributes[i].Name];
+						if (att != null && att.Value != attributes[i].Value)
+						{
+							return false;
+						}
+					}
+				}
 				return retval;
 			}
 			public bool Contains(string fullName, Type elementType)