> My main problem is, how to wait until the user pressed a button in my 
> modal window
> to return which button was pressed to the caller (like this: var ok = 
> window.confirm()).

This is not possible in JavaScript, since all JavaScript code is 
single-threaded.

You may only specify a callback method:

   var onExit = function(userPressedYes) {
     if (userPressedYes) {
       ...
     }
   };
   var dlg = new ConfirmDialog("Do you want to exit", onExit);




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