Tree item description

I need to set description on tree’s item , like when I roll over my mouse to the tree’s item It shows some description on current item, so how Can i do that, because even I get tree’s item (tree.getItem(ID)) I can’t setDescription on it.
Please help me with my question.

Best Regards,
Manvel Saroyan

Tree currently does not support per-item tooltips, nor does Table.

For Table, the corresponding enhancement request is
. I created an enhancement request about this for Tree (