Unity 5 mobile single stick control

Hi there, I recently update to Unity 5 and now working on a project on mobile platform. I tried to play around with the new CrossPlatformInput in Unity 5 and implement the "MobileSingleStickControl" prefab that built in under 2D asset. But I unable to get the control to work, the controller UI did shown in the screen but user cannot interact with the controller. I can't find any related example on using the control, mostly what I found are joystick control in Unity 4. Please provide me some example or suggestion on the controller. Thanks