Message Box

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The message boxes returns immediately so it always returns Messagebox.OK. Thus, it is meaningless to show buttons other than the OK button. For example, the if clause in the following example is never true.

 if (Messagebox.show("Delete?", "Prompt", Messagebox.YES|Messagebox.NO,
     Messagebox.QUESTION) == Messagebox.YES) {
     this_never_executes();
 }

Rather, you have to provide an event listener as follows.

 Messagebox.show("Delete?", "Prompt", Messagebox.YES|Messagebox.NO,
     Messagebox.QUESTION,
     new EventListener() {
         public void onEvent(Event evt) {
             switch (((Integer)evt.getData()).intValue()) {
             case Messagebox.YES: doYes(); break; //the Yes button is pressed
             case Messagebox.NO: doNo(); break; //the No button is pressed
             }
         }
     }
 );

The event listener you provided is invoked when the user clicks one of the buttons. Then, you can identify which button is clicked by examining the data (Event's getData). The data is an integer whose value is the button's identifier, such as Messagebox.YES.

Alternatively, you can examine the event name:

 public void onEvent(Event evt) {
     if ("onYes".equals(evt.getName())) {
         doYes(); //the Yes button is pressed
     } else if ("onNo".equals(evt.getName())) {
         doNo(); //the No button is pressed
     }
 }

Note: The event name for the OK button is onOK, not onOk.