I put my project under source code control using VSS. I then tried to modify a class of mine via the Project window. After I clicked the class name I clicked on the Modify button. I was then asked to verify that I wanted to check out the VCX file that contained the class. When I confirmed the checkout I got an error that said "Source control cannot operate on open file xxx.vcx. Close the file and try again." I click on the OK button and I am in the class designer working on a read-only version of the class.

I tried this again after restarting VFP and reopening the project. This time it worked! What do I need to do to close the class library file prior to making modifications?