Add reference into Common project

Question

Which type of VS project should I create if I want to create simple helper library which I can include into Common project.

I created silverlight library project and add some code but when trying to add into LS Common project I got this warning: 

Answer 1

You did well creating a Silverlight class library, but there are limitations. This thread I started in my early LS days I believe will answer all your questions.

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1+1 = 3 for large values of 1

Answer 2

Portable Library Tools

Further exploring I found these useful links:

Portable Class Libraries

Portable Library Tools

Answer 3

Thanks a lot for the links. Although now, after 8 months using LS, it's very easy for me to keep my portable projects portable, I wish I had read this links earlier. Never too late though. Thanks again for the links.

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1+1 = 3 for large values of 1

Answer 4

Portable Library Tools are only 6 month old. So they are pretty new Visual Studio plugin. And prerequisite is Visual Studio 2010 SP1...