treeview opens on hover

Hi, could you please help me to open treeview on hover? Thanks

Check

http://webix.com/snippet/035d1755

Great! Thanks
And could it open only one category? So if i move mouse on second category, first should be closed and second - opened?

what i have: http://webix.com/snippet/d15e8735

as you can see - i can open category on hover and open other category with closing previous, but if i want to check any subcategory - i cannot do it.

also - can a set new class to parent if one of it child is selected?