I’m wondering why the video capture button is always grayed out (disabled) when using the both the Camera Capture Task and the Photo Chooser Task with ShowCamera = true;?

I’ve tried to find ways to enable it, but without any success.
I’m developing for Windows Phone 7.5.
Thank you in advance!
It’s greyed out because Camera Capture and Photo Chooser both only support single images, not videos.
If you’re looking to capture video, take a look on MSDN here:
http://msdn.microsoft.com/en-us/library/hh394041(v=VS.92).aspx