Treeview (liststore) CSS question

[Mike Martin <redtux1 gmail com>]

Is it possible to set different background for a treestore, with a
liststore, for populated rows v blank area.

ie: If I have a dynamic treeview I would like to have one background colour
for the rows and another for the treestore where there are no rows

The particular example has the following tree
Grid,Notebook,grid,scrolledwindow,treeview

thanks
Mike