Smooth & Fast Stack Resize?

[Bill Marriott]

When I show the default decorations for a stack and resize it with the 
standard Windows controls, the window adjusts very quickly and smoothly. 
What I would like to do is to show no decorations and use my own custom 
controls for resizing the stack window. Unfortunately, the methods I've 
tried so far result in a very slow, herky-jerky resize of the stack window. 
Does anyone have a magic handler (that could be attached, for example, to a 
small rectangle graphic) that resizes the stack window as smoothly (or 
closely as possible) as the "OS native" resizing method works?