Magic Sheet Groups

I'm experimenting with buttons in my MS. I have made several groups for selecting fixtures. In MS Edit I add a [G] button and set the target to the number of the group. "Group 13" etc will then appear in the button. Eveyrthng works fine. But I would like to replace that text with my own like"LX1".

When I try this the "LX1" gets written on top of the "Group 1"!   I changed the button backgound to white to hide the "Group 13" then added my own text in a darker color which worked - but was wondering if there were a better way to hide the group text?