How can I avoid the Visual Studio 2010 message "(Build Only Project) which is not currently available"?

I've bound the key combination Ctrl+B, Ctrl+B to the Build Only Project command. I have a solution with a web application, several business layer dlls, and several Silverlight projects. I want to build the Silverlight project I'm working in with the key stroke to avoid building everything everytime. I'm gr开发者_如何学JAVAowing tired of having to right click on the project, then clicking build everytime. Why isn't Build only project available and how can I make it so?

If finally revisited this and realized that I could create a macro in Visual Studio 2010. Here is the macro script (very basic). Maybe it will help someone. I mapped it to ctrl + 6, 6 to avoid to much movement from my mouse.

Sub BuildCurrentProject()
  DTE.ExecuteCommand("ClassViewContextMenus.ClassViewProject.Build")
End Sub

This works well with the "Solution Navigator" from the Visual Studio Productivity Power Tools extension