In my Sencha Touch 2 pr3 app, I have the following line of code to display a list in my "myList" list panel.

MyApp.cards.query('#myList')[0].setStore(store);
Everything works fine in SenchaTouch2pr3 - I'm able to view my list of items.

But, when I migrate to Sencha Touch 2 Beta3, the list doesn't display (just a blank panel area). There are no error messages in the console. Is this a bug in the Beta3 version?
Everything else seem to be working in my app, except for the list.