In the specific case of RB, Gossip and Evolution, it seems that people want to prettify treeviews for this kind of thing, assigning specific visual style to elements that hold different meaning (e.g. first level heading, second level heading, etc.). Perhaps we should come up with a way to do this, so that all apps look consistent.
From my experience I can say that the the most common customization I
try to do is make the header or level n rows render differently to the rest. In this regard a simple way to do that would be much appreciated. I generally end up achieving the same thing via * Conditional behavior in cell_data_funcs * Pack multiple renderer's in a column and conditionally use each one depending on the level of the row. John