When attempting to choose Force stop or Uninstall for the App Center client app on an Android device, these options are grayed out / disabled.
These options are disabled by design if Mobile Device Management (MDM) is enabled and applied to the device (e.g. The device's associated user is a member of a group which has an MDM policy applied to it).
If a Force stop or Uninstall action must be performed on the device, the App Center client's device administrator privilege must be removed:
Note: The steps for this example are applicable to an Android 4.0.4 device