Applescript resize group

Question

How I can to resize grouped object using absolute dimensions?
I tried that but I'm newbie into Applescript
tell active document
  tell group items "<gruppo>" of layer 1 of page 1
  set absolute horizontal scale to 55 as real
  end tell
  end tell

Answer 1

Ok, half of the problem is solved with this code:
tell application "Adobe InDesign CS5.5"
  open "Macintosh HD:Users:matteo:Desktop:template.indd"
  tell active document
  tell group "MyGroup"
  set properties to {horizontal scale:50, vertical scale:50}
  end tell
  end tell
end tell
Now I like to resize using 4 parameters: X and Y coordinate, width and height in millimiters: How I can do?
Anyone can help me?