Is there a widget for drawing n-ary trees?

[Maike Erdmann <gtk pasture de>]

Hi all,

I'm looking for a widget that draws n-ary tree structures (please have a 
look at the example: http://www.pasture.de/tree.jpg). The nodes 
themselves also contain widgets.

I don't have much experience with GTK. Is there a widget I can use or 
inherit or do I have to start from scratch with drawing arrows and 
rectangles?

Thank you very much in advance for any suggestions. And let me know in 
case I should give more detailed information.

Yours,
Maike