I have created a custom user control and I am using that on my webform using ajaxToolkit:ModalPopupExtender to open as a popup on a button click. On this popup window I have added two radcombo boxes and I want on selection of one rad combo box other should give corresponding selection (like radcombo1 has groups and radcombo2 has users, on selection of a group or groups in radcombo1 then corresponding users should be coming up in the radcombo2). The main problem here is when I set autopostback true for radcomb1 one the entire webpage is getting reloaded, closing the popup window(custom control), then again I have to click the button to open the popup. I tried to use radajaxmanager to solve the issue but i couldnt solve the issue.I would request you to give me any sample example for better understanding.
Here I have create a custom control UC.ascx and I am calling this custom control on CS.aspx using ajaxToolkit:ModalPopupExtender, I have put the rad combo boxes on UC.ascx.