Drag and Drop example does not work

The drag and drop example attached with PR3 (even PR1) does not work. Following is the error

}
this.mgr.on({

sencha-touch-all-debug-w-comments.js:48102 Uncaught TypeError: Cannot call method 'on' of undefined



dragstart: this.onDragStart,
scope: this
});
this.disabled = false;


Error is on 48102 (sencha-touch-all-debug-w-comments.js)

I reported this as a bug. I have done this and it works in an app I am building:

Code:

---

        Ext.create('Ext.util.Draggable', {
            element : el
        }, {
            revert : true
        });

---

constraints are off but I can drag it around with no errors.