I’ll try that in another way) I want not only categories be able to collapse, but Title as well.
http://wordpress.org/extend/plugins/wp-dtree-30/screenshots/
last screen shot – is it possible to make categories “october 2007” and “october 2006” folds up in title “Archives”? October 2007 and 2006 must be hidden till user clicks on title “Archives”. I need this cause i’ve got a huge amount of categories in probably 5-7 Titles (i add widget WP-dTree Categories 5-7 times). And it will be more suitable not to make user scrolling down before he finds necessary information.