[Seaside] SeasideXUL - editable trees (tables)?

[Milan Zimmermann]

Hi Pavel,

There is a way in XUL to make trees (tables that are really trees) editable. 
Is it possible in SeasideXUL to generate the editable attribute?

I have a followup, XUL rather than SeasideXUL question: Let's assume a tree is 
editable. Currently, to edit a cell, one has to double-click. I wonder if  
there is a known straightforward way to edit a cell just by tabbing into it?

Thanks Milan