transparent canvas working in gtkextra-2?

	Version: gtkextra-2 from CVS as a couple of weeks ago.

	I have successfully been using multiple plots on a canvas, with all the
plots transparent.  Today for the first time, I tried making the canvas
transparent also, so I could see through the plots and the canvas to
what is below.  However, the canvas is not transparent when I set it
with gtk_plot_canvas_set_transparent().

	I have tried a small test program that just creates a canvas as a child
of a parent window that has a blue background.  When I set the canvas to
transparent, I still have the while background of the canvas, instead of
seeing the blue background of the parent, so I know the canvas has not
become transparent.

	Is this a known problem?  Do we have a workaround?

	Thanks!

-Al





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