Problem with Project file in TFS Source Safe

Hi there

How to avoid having the project file in Source Safe but have all the project items in it?

In the picture above the project file BBBSilverlight.Web is in the Source Safe and it is checked out. As soon as another user adds something into the project, it needs me to check it in. The latter operation overrides the another user's project settings, namely, the Web Host URI. This is a huge problem. How to fix it?

Thanks