My company has just recently upgraded to AutoCAD 2007. We have been told to set a custom .cui as our main customization file. The Acad.cui is now (read-only). I transferred the object snap shortcut menu over to my custom.cui and made some modifications with no problems. I would now like my modified snap menu to be displayed when I hold down shift and right-click. I cannot change the mouse button settings in the acad.cui because it is read-only. I cannot change the mouse button settings in my custom.cui because there are no entries under it. Not even a plus sign next to the mouse buttons entry. How can I add shift+click to the mouse buttons portion of my custom.cui?