FlexGridSizer not resizing custom control

[Jeffrey Barish]

I am trying to create a custom control that simply draws a stretchable
horizontal line.  When I put the control in a horizontal BoxSizer, the line
stretches when the window resizes to fill the space available, as it
should.  When I put the control in a growable column of a FlexGridSizer,
the line does not stretch.  I'm probably doing something wrong with the
FlexGridSizer, which I have never used before, but maybe I've done
something wrong in the custom control even though it works correctly with
the BoxSizer.  With the FlexGridSizer, the growable column grows as it
should, but the ClientSize for the custom control does not change.  The
ClientSize does change when I use the control with the BoxSizer.
-- 
Jeffrey Barish
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