private void showEventGraph(final AbstractCanvasHandlerEvent canvasHandlerEvent) {
   doShow(canvasHandlerEvent.getCanvasHandler().getDiagram().getGraph());
 }
 private boolean checkEventContext(final AbstractCanvasHandlerEvent canvasHandlerEvent) {
   final CanvasHandler _canvasHandler = canvasHandlerEvent.getCanvasHandler();
   return canvasHandler != null && canvasHandler.equals(_canvasHandler);
 }