GtkFixed redraws

[Matt Moseley <list_matt bellsouth net>]

I have an application where I dynamically add GtkButtons to a GtkFixed area.  Whenever I add a button to the 
fixed area, everything to the right of and below the top left of the button I'm adding gets cleared out and 
then redrawn.  This produces a flicker effect.  The flicker is compounded by adding several buttons to the 
fixed area at a time (without returning control to the main loop); instead of one clear and redraw, there are 
clears and redraws for each button.  From the documentation I've read,  GTK widgets are supposed to be 
double-buffered so that things like this don't happen.  I also read somewhere that the areas for the redraws 
should be intersected so that only one redraw happens for all of the invalidated areas.  Obviously this isn't 
happening in my case.  Can anyone suggest a way to stop the multiple redraws, as well as make only the button 
area redrawn (as opposed to everything to its right and below)?

Matt