[wxPython] wxMVCTree Scrollbar Problem

I am using wxMVCTree as per listing below for
processing of a directory hierarchy. When I open a
directory that results in the listing exceeding the
vertical page length the horizontal Scrollbar widget
dissapears and the vertical Scrollbar lengthens to
take up the marginally increased space! Does anyone
know the cause of this buglet, and more importantly a
fix?

John

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