How to make a play of two players?

UFB2 example, I have two joysticks, one on each end of the screen, where each control a character, I'm probema in multitouch .. It follows the file:

mega.nz/#!184XnTKA!mVaDvoDK6ku_M2uNdKCc_YsxDTw5Jva4tVRt7uiaro4

leonardovilarinh

I posted an example of 2-player on-screen controls here or you can download directly here

Basically, I give the control sprites and and the player sprites an Instance Variable called "Player" and when the controls are touched I pick the player sprite with the matching Instance Variable and only move that one.