backgroundBehavior ?

[Richmond Mathewson]

Well, one is never too old to learn new (old?) tricks . . .  :)

So, I created a main stack and made a group on the first card (called 
"gBOX")
consisting of a button and a field; then popped this into the Message Box:

set the backgroundBehavior of group "gBOX" to true

hoping that as I made new cards my group "gBOX" would automagically
appear on them: but it didn't . . .

Please advise . . .  :)