RadCombobox Partially Updation on RadCombobox SelectIndexChange event

[Manoj]

Dear All,
I am getting problem when I want to update
country Radcombobox with Continent RadCombobox OnselectIndexChanged event
where I put RadCombobox AutoPostBack  property to true.

And Applied radajaxmanager with UpdateControl though its not updating partially

What might be the problem

plz assist me about this problem

Before that I was using following tactics but was not solved mine problem
http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multiplecomboboxes/defaultcs.aspx


Thanks & Regard
Manoj Chavan
Exa India Pvt ltd