Tab switch cancellation problem

[krzycuh]

Hi All,
I want to switch between two tabs in TabSet only when some condition is true (only when tab data was saved) and then initialise
selected tab.

Scenario:

When user click on another tab I want to ask him if he want to save provided data before swithing a tab. I'm catching TabDeselectedEvent
using TabDeselectedHandler() and in onTabDeselected method I'm calling SC.ask("You have to save your data first. Ok?") alert with a question.
Beacause SC.ask(...) returns user's decision asynchronously I have to remeber newly selected tab and to cancel the event and
then to call SC.ask(...). When user decision equals true I'm saving user data and then trying to switch a tab.


Problem:

The problem is that selected tab stays empty (previous is fine but each another stays empty).
It appears when after selection I'm trying to put some canvas (content) into a tab I'm switching to.
I want to initialize tab content and data on first selection (before not selected tabs are empty).
I also need to reinitialize tab data on every selection (to always show a fresh data).


Am I doing something wrong or is there a bug in smartgwt?
Because there's no possibility to stop tab switching in 2.2
release I'm working with 2.3 snapshots. Currently it's
revision 1359


Here's my code:

public class TabbedPane extends TabSet {

    MCXTab oldTab;

    public TabbedPane() {
	this.data = data;

	this.addTabDeselectedHandler(new TabDeselectedHandler() {
	
	    @Override
	    public void onTabDeselected(TabDeselectedEvent event) {

		MCXTab tab = (MCXTab) event.getTab();
		TabbedPane.this.newTab = (MCXTab) event.getNewTab();
		event.cancel();
		tab.save();	                                        //invoking method with 
                                                                        //asynchronous SC.ask
		
		EventBus.subscribe("new Tab",		//asynchronous answer 
                                                                        //from tab.save
			new TopicSubscriber<Object[]>() {

			    @Override
			    public void onEvent(Subscription subscription,
				    Object[] answerObject) {
					Boolean answer = (Boolean)answerObject[0];
					if (answer) {
					     int num =TabbedPane.this.
                                                  getTabNumber(newTab.getID());
								  
                                             TabbedPane.this.setSelectedTab(num);
						
                                             //init next Tab:
                                             TabbedPane.this.newTab.
                                                   initLayout(TabbedPane.this.data);  
					} else {
							//if answer = false tab should'n be 
                                                        //changed
					}
				    }
			    }));
			}
		});
		this.addTabSelectedHandler(new TabSelectedHandler() {
			@Override
			public void onTabSelected(TabSelectedEvent event) {
				MCXTab tab = (MCXTab) event.getTab();
				tab.initLayout(TabbedPane.this.data);
			}
		});
	}
	
	
	
public class MCXTab extends Tab{
    
    InitiableComponent componentToDraw;    
    
    public MCXTab(InitiableComponent componentToDraw){
		super();
		this.componentToDraw = componentToDraw;
    }
    
    public void initLayout(EntityComponentData data){
		Canvas canvas = (Canvas) componentToDraw.initLayout(data);
		canvas.redraw();
		setPane(canvas);
    }
    
    public void save(EntityComponentData data){
	this.saveData = data;
	SC.ask("save changes?", new BooleanCallback() {

	    @Override
	    public void execute(Boolean value) {
			if (value != null && value) {
				componentToDraw.save(data);
				EventBus.publish("new Tab", new Object[] { true });
			} else {
				EventBus.publish("new Tab", new Object[] { false });
			}
	    }
	});
    }
 
}