[gtkmm] contolling screen updating in Layout widget

[Nathaniel Virgo <nathaniel virgo ntlworld com>]

Hi,

I have a collection of widgets in a Layout container.  The user can drag them 
around, so sometimes they overlap and go behind one another.  I want the user 
to be able to bring a widget to the top by clicking on it.  The only way I 
can see to do this is to remove the widget from the container and then put  
it back again in the same place.  This works, but it causes a little flicker 
because the screen gets drawn to after removing the widget as well as after 
putting it back - so I was wondering if there's a way to temporarily switch 
off drawing or buffer swiching or something while I move things around.  Or 
is there a better way to approach what I'm attempting?  

(gtkmm = 2.0.2)

thanks in advance,

Nathaniel.