Stops the transition playback.
HRESULT retVal = object.Stop();
This method has no parameters.
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
If playing, this method stops playback and sets progress to the end (1.0) of the transition. The HTMLFrameSiteEvents::onfilterchange event is not fired when the user calls ICSSFilterDispatch::Stop on a transition that's currently playing.
If using two inputs, this method disables the filter. Call ICSSFilterDispatch::Apply again to re-enable the filter.