[pygtk] Transparent treeview background

[Andreas Sommer]

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
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