Class hierarchy for thumbnailctrl

I was looking at the example code for the thumbnailctrl class and 
reading at the documentation so I could understand how to use it.
The class documentation is at 
https://wxpython.org/Phoenix/docs/html/wx.lib.agw.thumbnailctrl.ThumbnailCtrl.html#wx.lib.agw.thumbnailctrl.ThumbnailCtrl
or https://wxpython.org/Phoenix/docs/html/wx.lib.agw.thumbnailctrl.html

The two descriptions of the ThumbnailCtrl widget are different, which is 
confusing.  More confusing is that many of the methods used in the 
example were not listed in the class documentation.  I found these 
methods defined in the ScrolledThumbnailCtrl, but neither ThumbnailCtrl 
or ScrolledThumbnail are in same inheritance tree.  ThumbnailCtrl 
inherits from Panel, while ScrolledThumbnailCtrl inherits from 
ScrolledWindow.

It was not clear when or how ScrolledThumbnailCtrl was supposed to be 
used.  (It now appears that it should not be used.)

When I looked at the code for ThumbnailCtrl, I saw it contains an 
instance of ScrolledThumbnailCtrl and that many of the latter's methods 
are copied into the method list for ThumbnailCtrl.

Can anyone explain why this is being done?  It would seem cleaner (and 
definitely more understandable) to have ThumbnailCtrl inherit from 
ScrolledThumbnail and Panel.

-- 
Michael Eager

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