How to use 2 dropdownlist in ModalPopUpExtender using AutoPostBack

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C#

ASP

Hi all ,

I am using a ModalPopupExtender and in Panel, I've 2 dropdownlist.
Select Network : <asp:DropDownList ID="ddlNetwork" width="150px" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlNetwork_SelectedIndexChanged">

Select People : <asp:DropDownList ID="ddlPeople" width="150px" runat="server" >

ddlPeople is loaded depending on selection of ddlNetwork but since its a ModalPopupExtender, the page gets loaded. And without using AutopostBack="true" in ddlNetwork the values in ddlPeople will not get loaded..

How to use this ????