diff --git a/src/Main/Base/Project/Dom/ClassBrowser/BaseTypesTreeNode.cs b/src/Main/Base/Project/Dom/ClassBrowser/BaseTypesTreeNode.cs
index 5780db317f..386242a9c0 100644
--- a/src/Main/Base/Project/Dom/ClassBrowser/BaseTypesTreeNode.cs
+++ b/src/Main/Base/Project/Dom/ClassBrowser/BaseTypesTreeNode.cs
@@ -6,6 +6,7 @@ using System.Linq;
 using ICSharpCode.Core;
 using ICSharpCode.NRefactory.TypeSystem;
 using ICSharpCode.NRefactory.TypeSystem.Implementation;
+using ICSharpCode.TreeView;
 using ICSharpCode.SharpDevelop.Parser;
 
 namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
@@ -36,6 +37,12 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 			}
 		}
 		
+		public override SharpTreeNode FindChildNodeRecursively(Func<SharpTreeNode, bool> predicate)
+		{
+			// Don't search children of this node, because they are repeating type nodes from elsewhere
+			return null;
+		}
+		
 		public bool HasBaseTypes()
 		{
 			return baseTypes.Count > 0;
diff --git a/src/Main/Base/Project/Dom/ModelCollectionTreeNode.cs b/src/Main/Base/Project/Dom/ModelCollectionTreeNode.cs
index 3aa1f0565d..fc1ab8ca50 100644
--- a/src/Main/Base/Project/Dom/ModelCollectionTreeNode.cs
+++ b/src/Main/Base/Project/Dom/ModelCollectionTreeNode.cs
@@ -105,7 +105,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			LazyLoading = true;
 		}
 		
-		public SharpTreeNode FindChildNodeRecursively(Func<SharpTreeNode, bool> predicate)
+		public virtual SharpTreeNode FindChildNodeRecursively(Func<SharpTreeNode, bool> predicate)
 		{
 			if (predicate == null)
 				return null;