My WP7 app used C# to change the app bar buttons (see example on StackOverflow), but your solution is much more elegant. Well done!
I am not really sure if it will work on WP7. Hopefully it will. If you try let us know the results.
Wondering if you could provide a sample to download and see how it works. My email is email@example.com if you want to shoot it over to me, i've been pulling my hair out with this.
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