Does anyone know of any examples of using KML or image tiles with Sencha touch?

I have been working on this for days and never get consistent results.

I have used KML in non-sencha apps before and have had no issues like I am having now.

Sample code I am using:
'afterrender': function(comp, map) {
    var foo = new google.maps.KmlLayer('http://domain.tld/less_than_3mb.kmz');