It's rather simple :

First keep somewhere your present parameters, then, during execution, when you want to flip to FullScreen, just do as follows :

1- Set BackBufferWidth, BackBufferHeight, and BackBufferCount of the Present Parameters(i.e 1024, 768, 1);
2- Set the BackBufferFormat : D3DFMT_A8R8G8B8 (I'm not sure ...)
3- Just Reset your Device : GfxDevice.Reset(Present);

And your app will pass in fullscreen !

Hope that helped ! Let me know if the format isn't good !

Bye
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