BitmapButton shows focus erroneously

[Jeffrey Barish]

Consider the attached program.  The BitmapButton has a left arrow (taken
from the demo program).  It changes to a right arrow when the button has
focus.  The button should never have focus because the handler for the set
focus event assigns the focus to the TextCtrl.  However, if you click on
the button or hit tab, the button will show the telltale dashed line
indicating that it has focus and the bitmap will change to the right arrow. 
It doesn't really have focus, though, as keyboard input still goes to the
TextCtrl.  The BitmapButton seems to be in a strange state where it thinks
that it has focus but doesn't.
-- 
Jeffrey Barish
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