How to stop page from refreshing after confirmation box?

I have this code inside a a method that forms a menu in Ext:

  handler: function() {
     var r = $wnd.confirm("Are you sure?");

When I use $wnd.alert, it just shows a popup. When replaced with confirm, it works but then causes the whole page to refresh after a selection. Ideally, I'd like to use $wnd.Ext.MessageBox.confirm, but when I use that, I get the error cb.defer is not a function. Figuring out how to get the javascript confirm to work will be much appreciated.


I would suggest one (or a combination) of these options:

event.cancelBubble = true;
return false;

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