Vista - MediaElement MediaOpened Event Problems

Hi

I have created a MediaElement programmatically and added it to an
ElementHost within a windows form. I am attempting to load the video
in the background before making it visible and playing it.

I have created a AutoResetEvent which I use to determine when play may
start. That is, I set the MediaElement source property, then call
WaitOne on my AutoResetEvent. I expect the MediaElement to load in the
background, then call the MediaOpened event. Within this event I set
the AutoResetEvent, so allowing the load and play function to
continue.

The problem that I am experiencing is that unless the control is
visible and play has been pressed, the MediaOpened event never fires.

Has anyone any thoughts as to a workaround for this?

Thanks

James