Add project to an existing Monodevelop (Mono Touch) solution

Where is the command/button/dialog to a开发者_如何转开发dd a project to an existing mono touch solution?

e.g. I have a MonoTouch App and I want to add a class library to the solution.

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It seems as if my IMac was not responding in the normal fashion for CTRL Click. Got around this with double click to get to context menu