[gtkmm] Retrieving the stacking order of Gnome::Canvas::Items.

[Dale Wiles <dwiles Buffalo Gd-Ais Com>]

  I have a GTK app that places a bunch of Gnome::Canvas::Items on to
a Gnome::Canvas::Canvas.  The user can then click on the Items and move
them around.  When the item is clicked on it also raises to the top.

  My problem arises when saving the results of the clickage.
I can get the X and Y of the Items, but I can't figure out how to
find the Z (stacking order).

  Does anyone know of a way to get the Z of an Item, or get a list
of Items sorted by stacking order?

				      Thanks,
					Dale

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