Problem with resizeControl

[René Micout]

Hello,
I have a problem (simple but...) :
2 buttons (button 1 and button 2), with these 2 buttons I made a group.
The script of the group is :
on resizeControl
   set the width of btn "Button 1" to (the width of me)-30
end resizeControl
When I resize the group it is OK but when I release the mouse the group and the button grows...
What is wrong ?
Thank you
René