Button in the menu bar, why is it lit?

I have put some menu item from a sub menu to the main menu bar, for the Go TABGROUPLOAD=xyz command. It is green lit, for no apparent reason. I find no option in its button settings to turn it off. Is there a way to change it, or is the button just telling me, that the tab group in question is active?

It means xyz was the last tab group you loaded.

You can turn off the highlight if you don't want it:

Ok, i see. It worked. Thank you.