TouchEvent not work on multiple Objects

I am trying to put 5 buttons in layout of Sample Application Cloud Recognization.The buttons appear in two different ways:1. When tracker is detected, the buttons gets augmented to the tracker.

2. When camera gets away from the tracker the buttons gets struck to the screen.

Display is working fine with both the case but touch event of buttons doesn't work for first case (augmented buttons). I need to do different task on each buttons. Common handler as like default CloudReco handler will not work for my case.So my question is...1. Can I get button's event handler called in case when button is embedded to tracker.2. Is there any way to transform user's touch screen-coordinates to button's screen coordinates?