How do I get value of gamepad trigger press?

I'm trying to get the amount the right trigger has been pressed on my gamepad. I want it to be like this: http://www.html5rocks.com/en/tutorials/ ... ester.html where when the trigger is pressed, it gives a value of how much it is pressed, instead of classing it as a button. In C2 I can only seem to use the axis expression for the sticks. How can I use the trigger like this?

I helped someone in this topic to get the values: