Zune Button Mapping
For input, the Zune device has two buttons and either a device control pad (version 1.0) or a Zune Pad (version 2.0). These inputs map to controller input, retrieved with the GamePad.GetState method.
Back and Play/Pause Buttons
Device Control Pad (version 1.0)
The control pad provides input for presses (or 'clicks') on the pad.
Directional presses on the control pad map to the GamePadState.DPad directions: up, down, left, and right, or to a combination of two of those directions. Pressing straight down in the middle of the control pad maps to GamePadState.Buttons.A.