code: public void onClick(MenuItemClickEvent event) {
  		FeatureTransaction featureTransaction = mapWidget.getMapModel().getFeatureEditor().getFeatureTransaction();
  		if (featureTransaction != null) {
  			controller.cleanup();
  			mapWidget.render(featureTransaction,  RenderGroup.VECTOR, RenderStatus.DELETE);
  			mapWidget.getMapModel().getFeatureEditor().stopEditing();
  		}
  	}
docs: Cancels editing, and also removes the FeatureTransaction object from the map.
  
  @param event
  The {@link MenuItemClickEvent} from clicking the action.