I am testing the device app for camera on OS Win8RTM. The sample is all right on OS Win8RC. I choose the C++ version .
The initial effect of MFT0 is :

The green part has part of the screen. The value of slider shows fifty. It's OK!
Now, I change the slider, the value shows one hundred and the effect of Media has show. However the ring of slider is still in the center. It seems there is problem about the slider!!!
