control inside an update panel not updated

i have a dropdown list inside an update panel of ajax, i have a button that says "Add" on the click event of the button i will load a pop-up screen. the popup screen works as entry area of the drop down list i have mentioned. upon saving and unloading the pop-up screen, it should update the dropdown list contents. any help please, this is my first time to handle ajax..

Hi,

You question is about cross window scripting.

First, find the dropdownlist in the parent control.

var ddl = window.opener.document.getElementById("id of the ddl");

then add new item into it:

ddl.options.add("new value");

Hope this helps.