TreeView expander arrow behaving strangely

[Scott Baillie <sbaillie bigpond net au>]

Hi,

I have built a simple program with a TreeView in it ( using a
TreeStore model ). I have populated the model with nodes and
the TreeView has correctly displayed the nodes.

When I use the expander arrow to try to expand and collapse
the nodes in the tree, the behavior is bizarre !
Wnen I try to expand or collapse a node, a different node will
often expand or collapse.
I have found that if I completely leave the TreeView widget and
then re-enter it ( with the mouse ) the TreeView behaves normally
for one click and then returns to bizarre behavior.

I am using GNOME 2.18 fetched using garnome, glade-3 for the
user interface, glade-mm and gtk-mm.

P.S. : If my problem is not a gtk-mm problem, any chance of
     : looking at my code, its a very simple program.

Regards,

Scott.