Unfortunately thats not true with kinematics. You can simulate two contact components using 1 mechanism. This is the way we recommend you use the tool.

Create 1 mechanism that will define you movement.
Create two commands, 1 for the movement of the finger (pris) and one for the movement of the button (pris). Ensure both are driven joints.
The mechanism now displays 2 commands in the simulation dialogue box.

Create a law that ties the two together. Set one joint going on a linear movement. (single line in a sketch) and set the other so that the value remains 0 until the other component comes into contact with it. The set this command moving at the same linear rate.

Sounds complex but is very simple if you have done it once before.

Take a look at the example model here:

CADHandy.com - Downloads | Catia V5

Gareth