Connecting lines in TreeView

[Tor Arvid Lund <tor arvid lund idi ntnu no>]

Hello. I recently started programming with gtk2 (gtkmm, actually), and 
my question is:
How can I get a TreeView that displays the connecting lines between the 
nodes? Like in gtk1.2, Qt, Windows, etc...
I heard a rumor that it was not supported by the toolkit. Is this true, 
and if so, will it be "fixed" in 2.4? The lines really help the 
readability of a large tree IMHO, so I would almost call it a bug if it 
couldn't be done...
I tried searching for this subject (to no avail). Any answers are 
appreciated.
-Tor Arvid-