diff --git a/components/ideintf/objectinspector.pp b/components/ideintf/objectinspector.pp
index 7f589750ed..462f0bf8b2 100644
--- a/components/ideintf/objectinspector.pp
+++ b/components/ideintf/objectinspector.pp
@@ -1807,6 +1807,7 @@ begin
   //         ' Items.Count=',ValueComboBox.Items.Count ,' Text=',ValueComboBox.Text]);
   Exclude(FStates, pgsChangingItemIndex);
   DoSelectionChange;
+  Invalidate;
 end;
 
 function TOICustomPropertyGrid.GetNameRowHeight: Integer;