GtkTreeSelection event three times???

[Martyn Russell <ginxd btopenworld com>]

Can any one explain to me why the selected event 3 times when I select a
row on on my GtkTreeModel? 

I set the selection function with (I am using GTK_SELECTION_SINGLE):

  gtk_tree_selection_set_select_function(...);

and I print out the information passed when this is called and here is
the output:

20:00:45:OC:32: selected workgroup, is selection:true, path:0x082f36b8,
path_currently_selected:false
20:00:45:OC:32: selected workgroup, is selection:true, path:0x082eeb20,
path_currently_selected:true
20:00:45:OC:32: selected workgroup, is selection:false, path:0x082ee4f8,
path_currently_selected:false