Visual Studio 2010 Professional Play Button Disabled

I had problems with one of my projects in VS2010 Pro, this will not allow me to press the debug button at the top of the screen, it was disabled when I open other projects or launch new ones that he included in a new project / another project, however it’s disabled in one project, I don’t know what I changed (it’s been a while since I opened it, when it made me angry the last time I opened it), what can I do to turn on the " play"? (debug), this is a Windows Phone 7 project, and I was messing around with .csproj code.

Edit:

Menu items are disabled. "Start debugging: F5" also does not work.

Thank.

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