Question:  What command do I use to resize/scale a group programatically like the diagram view does when you drag the handle bars (i.e. obey ResizeInAggregate property of child shapes)?

Explanation:  I have a complex object of a main shape and several child shapes around it's perimeter.  Like:

73% of original size (was 689x19) - Click to enlarge

The child shapes have all their ResizeInAggregate property set to RepositionOnly.  So I only want to resize the main shape and re-position the child shapes.  This works fine in the diagram view when I resize by dragging the handles:

73% of original size (was 689x19) - Click to enlarge

But at times I need to programatically do it.  When I tried to scale the group with
public virtual void Scale(CoordinateSystem system, float scaleX, float scaleY, NPointF pin);
it scaled the child shapes and not just re-positioned them.  Like it ignored the ResizeInAggregate property:

73% of original size (was 689x19) - Click to enlarge

 I must be missing something.

Thanks in advance.