TabDeselectedHandler, event.cancel(), SC.say() is inactive for a while

[narvik]

It is not possible to close the SC alert box when cancelling the TabDeselectedEvent for a few seconds.

	@Override
	public void onModuleLoad() {
		TabSet tabSet = new TabSet();
		
		Tab tabOne = new Tab("One");
		Canvas tabOneCanvas = new Canvas();
		tabOneCanvas.setBackgroundColor("red");		
		tabOne.setPane(tabOneCanvas);
		tabOne.addTabDeselectedHandler(new TabDeselectedHandler() {
			
			@Override
			public void onTabDeselected(TabDeselectedEvent event) {
				SC.say("oh no!");
				event.cancel();				
			}
		});
		tabSet.addTab(tabOne);
		
		Tab tabTwo = new Tab("Two");
		Canvas tabTwoCanvas = new Canvas();
		tabTwoCanvas.setBackgroundColor("blue");
		tabTwo.setPane(tabTwoCanvas);
		tabSet.addTab(tabTwo);
		tabTwo.addTabDeselectedHandler(new TabDeselectedHandler() {
			
			@Override
			public void onTabDeselected(TabDeselectedEvent event) {
				SC.say("oh no two!");
				event.cancel();
			}
		});
		
		tabSet.setWidth100();
		tabSet.setHeight100();
		tabSet.draw();
	}