Transparent treeview background

[Andreas Sommer <AndiDog web de>]

Hi, I already posted this on the PyGTK mailing list with no responses. Maybe this is the better list to ask:

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I'm trying to create a TreeView that does not draw a background but only the row contents (i.e. the text). Doing

tree.window.set_back_pixmap(pixmap, False)
tree.window.shape_combine_mask(mask, 0, 0)

only makes the whole TreeView area transparent (in areas where I set pixmap's alpha to black). How can I make only the background transparent?

Best regards
    Andreas