"clicked" signal on a selected row in a TreeView

[Tilman Sauerbeck <tilman sauerbeck web de>]

Hi all,
in my app, I have a GtkTreeView widget with which I'd like to do the following:
If the user clicks the right mouse button on a selected row, a popup menu appears.

Now my problem is to catch that "clicked" signal, as I don't know to which widget I have to set the signal 
handler to.
I tried to connect it to the TreeView, the TreeModel and even the TreeStore :)

Any hint is greatly appreciated.

Regards,
Tilman

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