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Draw 3rd texture on click in Virtual button sample code.

I am making replica of kudan (Touch Interaction: Jaguar), and i am following virtual button sample. I successfully draw area like in kudan use tyre Headlight and indicator those are touchable areas, i done that. Now i want to show text area after click on tyre like in kudan. I also post question in stackoverflow http://stackoverflow.com/questions/12582077/draw-3rd-texture-on-click-in-virtual-button-sample-code-of-qualcomm-library-for. Please help me if you know. Thanks.