How do I get the virtual keyboard in Windows Phone 7?

I've read that this is not possible but that was from a discussion from about 4 months ago. Some Windows Phone 7 games do display the keyboard so surely it must be doable now?

edit: just to clarify I want to show it in an XNA a开发者_开发问答pplication.

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You can use the Guide.BeginShowKeyboardInput method.

In addition to the MSDN docs there is an blog post showing usage at http://luisguerrero.net/en/2010/07/17/how-to-access-to-keyboard-in-xna-from-windows-phone-7/