Understanding the File Tab Channel Drop Down Button

Versions:  2008,2010
Published:  4/2/2010
Code:  vstipEnv0012

 

This one is is something most of us probably have never noticed.  Did you know the File Tab Channel Drop Down Button changes?  Let's say I have a couple of files open, here is what the button looks like (far right):

image

 

 

But if I open up a few more files so that they all can't be seen on the File Channel, then the button changes to let me know there are files I can't see:

image