[Sencha Touch] [List Disclosure] Change icon

To change discloure icon, you must change two properties: -webkit-mask and -webkit-mask-box-image

For example

.examplelist .x-disclosure {
-webkit-mask: 0 0 url('../images/down-icon.png') no-repeat;
-webkit-mask-box-image: url('../images/down-icon.png');
}