group a single object?

[Geoff Canyon Rev]

I think this works reasonably well:

   put the layer of btn "target" into L
   set the relayerGroupedControls to true
   create group "container"
   put the long id of it into C
   set the layer of btn "target" to the layer of C
   set the layer of C to L

The business with long id is to make sure there isn't another group
called "container." When I first wrote this I just referred to it by
name, and then of course I tried it twice in a row and it failed the
second time. This version seems to work fine, ever-more-deeply nesting
button "target" into groups called container.