painting over an widget

[Stefan Kost <kost imn htwk-leipzig de>]

hi hi,

for my app I need a horizontal line scrolling over a treeview (indicates
playposition).
The first way I've tried to do it was using a gnomecanvas. I've put the treeview
as a canvas item on it and sent it to back. Then I've created a line and put it
over the tree-view. The problem is that gnome-canvas always shows the
widget-item on top. So I've dropped that idea.

Now I've trying to inherit from treeview and just override some of its methods,
chain up and the draw my own graphics over it. I am now looking at the
gtk-tutorial and trying to figure which method I should override.
Can anyone point me to some example?

Stefan
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