Why canReveal() of GateKeeper was called before the EventHandler was called (GWT)?

I got a Header presenter which is the nested presenter. The Customer presenter is the child of Header presenter (ie the Customer presenter was put into a slot of Header presenter).

So I want to use MyGateKeeper to manage login page. The HeaderPresenter that will fire PassUserInfoEvent.

public class MyGateKeeper implements Gatekeeper{  private String loginedUserID="";    private final EventBus eventBus;    @Inject  public MyGateKeeper (final EventBus eventBus){        this.eventBus = eventBus;          this.eventBus.addHandler(PassUserInfoEvent.getType(), new PassUserInfoHandler(){            @Override          public void onPassUserInfo(PassUserInfoEvent event) {              // TODO Auto-generated method stub              String userID=event.getUserID();              loginedUserID=userID;             }        });  }    @Override  public boolean canReveal(){      System.out.println(loginedUserID+"Test");      if(!loginedUserID.equals("")){          System.out.println(loginedUserMeaningID+"cxcxc");          return true;      }      else{          return false;      }  }  

}

In the CustomerPresenter:

@ProxyCodeSplit  @NameToken(NameTokens.cust)  @UseGatekeeper(MyGateKeeper.class)  public interface MyProxy extends ProxyPlace<CustomerPresenter> {  }  

However after run, it does not show the Gui even I loggined. I tested & found that canReveal() in MyGateKeeper was called before PassUserInfoHandler() was called, so canReveal never return true;

How to fix this problem?

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