         {
             owner.invalidateList();
             owner.columnRendererChanged(this);
+            _contextHeaderRenderer = null;
         }
 
         dispatchEvent(new Event("headerRendererChanged"));

        {
            owner.invalidateList();
            owner.columnRendererChanged(this);
        }

        dispatchEvent(new Event("nullItemRendererChanged"));

        {
            owner.invalidateList();
            owner.columnRendererChanged(this);
            _contextItemRenderer = null;
        }

        dispatchEvent(new Event("itemRendererChanged"));
