GtkExpander label widgets (using buttons as)

[David Caldwell <david porkrind org>]

I have a GtkExpander and I set its label widget to an hbox to which I added a
label and 2 buttons. They all display nicely, but the buttons don't work
properly. When I click on them it activates the expander instead of the buttons
themselves. Actually, a couple of the button's top and bottom rows of pixles
will respond to mouse clicks, but none of the center area does. Is this supposed
to work?

Thanks,
  David