Just to keep Vikas happy, here's an example showing a modal window, with an update event to refresh the calling page.

This time, the edit link attributes are:

    onClick="Ext.app.PopupWindow({url: this.href, height: 450},4009224866130853); return false;"


The function is:

Ext.app.PopupWindow = function (config,regionId) {

    var w = new Ext.ux.PopupWindow(config);
    w.on({
        'close': {
            fn: function () {
               /**  
                *  Refresh using Apex call
                *
                *  NOTE: 1. Assumes a "classic" report with Partial Page Refresh enabled
                *
                *        2. Doesn't deal with pagination - an exercise for the reader
                *
                */
                new Ext.LoadMask('report_' + regionId + '_catch', {removeMask: true}).show();
                $a_report(regionId,'1',null,'1');
            }
         }
    });

    w.show();
}

The popup form includes the following javascript in it's success message:

    Action Processed.
    <script type="text/javascript">parent.Ext.WindowMgr.getActive().close();</script>

Ditto for the cancel button.

The custom component js is not minified so it is readable. See popup-window.js.