Adding Controls And Referencing Them In Shared Development Environments

When you install a control (example MS AJAX Control toolkit), the path reference it adds defaults to where you installed the control (dll) which is typically outside of the project.

When you’re dealing with a shared development environment and source control. Add the DLL to the project (perhaps in \Lib) and then add a reference (In project / References) to that DLL now in the project.

That way all parties will be able to make use the control