@Override
 protected void anchorBoundsDidChange() {
   final Bounds lb = getAnchor().getLayoutBounds();
   messagePanelController.setPanelWidth(lb.getWidth());
   // This callback should not be needed for auto hiding popups
   // See RT-31292 : Popup does not auto hide when resizing the window
   updatePopupLocation();
 }
 @Override
 protected void makeRoot() {
   setRoot(messagePanelController.getPanelRoot());
 }