Use the formatted type name in BaseTypesTreeNode and DerivedTypesTreeNode.

ILSpy/TreeNodes/BaseTypesTreeNode.cs

@@ -94,7 +94,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		}
 		
 		public override object Text {
-			get { return tr.FullName; }
+			get { return this.Language.TypeToString(tr, true); }
 		}
 		
 		public override object Icon {

ILSpy/TreeNodes/DerivedTypesTreeNode.cs

@@ -109,7 +109,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		}
 		
 		public override object Text {
-			get { return def.FullName; }
+			get { return this.Language.TypeToString(def, true); }
 		}
 		
 		public override object Icon {