AngryBots mobile joysticks position

I've searched in code and the scene but I can't find where is specified the position of the left and right joysticks for mobile device. I understand how delimits and works with Gui texture pixel inset but I can't find where is specified the position on the screen for each joystick.

Ej: joystickLeft.x = 0.5*ScreenWidth;

Or something similar, but to me right now it's magic, some kind of spell.