Slate: Gamepad Interaction?

How would I go about setting up Slate to allow interactions using a gamepad such as the xbox 360 controller? I would like to know what steps are needed to allow it to focus onto a button for example but not activate the button until I press the A button or another button on the gamepad. I am not sure if it is already built in to allow that if you start using a gamepad with a slate widget focused or not. I have not been able to find any information about using a gamepad to interact with a slate widget.

Thanks