"Invalid Pointer" -after upgrade to WP7 Mango Toolkit

I started to upgrade my WP7 app Trafiken Sverige to latest version of windows phone “mango” and got caught in an ugly #bug Basicly what I done was upgraded my project type to 7.1 Get latest Toolkit (NuGet) Re-build (Work fine) Run App Bonk! Failure -hmm after lite investigation I found out it’s my name of controls…

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