Problems with moviePlayer

Actually I’ve got a problem concerning the playback speed of movies. In earlier versions of the program I used the expression moviePlayer.Rate to control the playback speed (i.e. slow motion etc) of a movie. Now I’m getting an error of an “non existing item”. In fact I didn’t change anything.
In the reference language page there is no “Rate” anymore and I couldn’t find an replacing expression.
Would someone be so kind to tell me how to program slow-motion and the opposite.

See Changes 2014r1.