I’ve sent code snippets to support@jqwidgets.com.
Actually I’m only checking/unchecking checkboxes. I think that rewriting second grid is heavy operation but usually there will be less then 10 items. Also I’d like to notice that even without grouping it is pretty slow in IE. Seems like I’m doing something wrong.
What if replace groupings with nested grids? Will there be any benefits from it comparing to grouped grid?