How do I zoom pinch?? - bug zooming

Hello everyone im working in a new mobile game and i would like to know how to "zoom pinch" ?? i know there is already a .capx example about Zooming using pinch but when i copy those elements (objects, layers, events, everything) to my game and i test the game on my phone, for some reason when im zooming it start to vibrate and the render of the game start to be double.

what would be the problem? also if someone can help me with other way to do a zoom pinch would be amazing!

thanks.

i tried this one last time i used, multitouch and onhold events. It detects my first touch and zoom in as touch slope coordinate changes. i'll check if i can still find my capx for this one.