jquery popup

I have followed the example at:
http://jquerymobile.com/demos/1.2.0-alpha.1/docs/pages/popup/popup-panels.html

I have managed to implement the popup and it works well, but I am new to jquery and cannot work out how to catch the click event in the buttons. I have placed the code for the  popupbeforeposition: function in script tags and this works I have tried placing data-click events in the buttons mark up  and adding custom code in the script tags but this never fireshow do I capture the events?

mark up:

<a href="#popupPanel" data-rel="popup" data-transition="slide" data-position-to="window" data-role="button">Open panel</a>
                  
<div data-role="popup" id="popupPanel" data-corners="false" data-theme="none" data-shadow="false" data-tolerance="0,0">

    <button data-theme="a" data-icon="back" data-mini="true">Back</button>
    <button data-theme="a" data-icon="grid" data-mini="true">Menu</button>
    <button data-theme="a" data-icon="search" data-mini="true">Search</button>
      
</div>

<script>
 $( "#popupPanel" ).on({
    popupbeforeposition: function() {
        var h = $( window ).height();

        $( "#popupPanel" ).css( "height", h );
    }
});
</script>