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Looking for an Ajax solution similar to CascadingDropDown but applies to listbox(with multiple selections enabled) instead.

I am looking for an ajax solution similar to CascadingDropDown, but it can be applied to listbox, for example, I have 3 listboxes(Catetory, Producttype, Product) all with multiple selection enabled; so if I select CategoryA and CategoryB in listbox 1(Category), listbox 2(Producttype) will list(populate) all Producttypes related to CategoryA and CategoryB, same rule applies to listbox Producttype and Product.
Since all listboxes are in multiple selection mode, each individual selectiion action should be able to 'remember' last selection item position after the postback(instead of alway starting from the top list of the Listbox).
Any working sample codes are HELPFUL!
1 Solution
Praveen VenuTechnical Project ManagerCommented:

or try placing them in an updatepanel and postbacking on selectedindexchanged.
RHADMINAuthor Commented:
Hi, Praveenvenu,
http://easylistbox.com/demoRelatedAjax.aspx is not my ideal solution, a perfect solution I found is http://www.codeproject.com/KB/ajax/ListBoxComponent0.6.aspx - an outstanding work!
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