I'm putting the finishing touches on a mod and would like to add a button to the toolbar that clears all the Fired markers from play.
So far I've got the Fired marker as a single level layer in the base prototype for every unit. I can add and remove it using the right-click menu.
I searched the yahoo group archives and saw some references to Global Key Commands and so I went and messed with those but the best I could come up with was a GKC button that removed all the fired markers from fired units and added fired markers to all unfired units

I know this is a common feature, but I don't have any other modules handy that have this feature for me to copy at the moment. Has anyone seen this elsewhere? Can anyone just explain how to do it? I know it's easy, I think!
-Shad