myGroup = app.selection[0];the strokes in the group are scaled (irrespective of the Transform Content setting). But in CS3, the strokes are simply moved to fit within the same bounds.
myBounds = myGroup.visibleBounds;
myBounds[2] = myBounds[0] + 1;
myGroup.visibleBounds = myBounds;
North America
Europe, Middle East and Africa
Asia Pacific