AJAX :: ModalPopupExtender Hides When Control In It Does PostBack?

Jan 10, 2013

I work with ModalPopupExtender (ajax control toolkit) asp.net

that is to say that a popup appears which contain one panel with 2 DropDownList (DropDownList1, DropDownList2)price starting from DropDownList1 the DropDownList filled due to the code behind.

My problem is that when I click on the DropDownList1 ModalPopupExtender that contain the Panel is gone because of AutoPostBack = "True" of DropDownList1.

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