[pygtk] TreeView reorderable

[Seltzer]

Hi,
  I have a tree view which contains a list of media items to be played, and
some information about them.
I would like to be able to let the user re-order this list, but if i just
use "set_reorderable(True)" than they can actually
drop one item onto another, and make the dropped item the child of the item
it was dropped onto.  I need to disable this some how, so that you can
reorder the list, but not not drop one item into the other, just re arrange
them.
I am also restricted by pygtk version 2.4

thanks for the help,
felix.
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