mousedown / mouseup events on ExtJS 4 buttons

I'm trying to make a button fire the mousedown and mouseup events on ExtJS 4, but I cannot find a properly way to do this.

I was trying to do something like this on my controller:

init: function()
{
    this.control(
    {
       'button[itemId="pttButton"]': 
       {
          mousedown: doSomething,
          mouseUp:   doSomethingElse
       }
    });
}

but these events don't seem to exist.

What's the best way to do this other than access directly the dom and using native Javascript events?