Rotate the viewfinder & Capture a portrait image in Windows Phone

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Hi,all

I'm creating a camera app based on Silverlight/XNA framework as the yan_ 's example Use Camera with XNA, but in when the page oritation changed to the Portrait , the viewfinder of camera dose not shows correctly, the direction of viewfinder dose not rotate when the page oritation changed, and the captured picture is also in landscape layout(width > height),not portrait layout(height > width ).

How could I rotate the viewfinder when the page oritation changed to portrait and capture a portrait layout picture.

If you don't understand what I said, just check out this similarly post on MSDN forum:video recorder sample - viewfinder orientation issue

Could anyone give me a hand, thanks in advance.

Regards.