Unfortunately, kinect isn't sensitive enough to detect grasping. You'll notice that kinect navigation, hitting a button relies of hovering your arm in place as

Unfortunately, kinect isn't sensitive enough to detect grasping. You'll notice that kinect navigation, hitting a button relies of hovering your arm in place as a bar fills (there are variations), but there's no 'poke' or 'detect fist' there. You can dream though.