question on scalable frame

Hello,

I am using Tkinter to create a scalable/expandable frame and using pack() to 
manage it. On the frame there are several dynamically created sub-frames. 
The top level frame is expanded automatically with the increasing number of 
sub-frames. But after I adjust the size of the top-level frame using mouse, 
it cannot expand automatically.  Is it normal? Or how can I resolve it? 
Thanks.

regards,
Weining

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