I am having a Listview where each row is having a button to call the modalpopup, and everything work correctly, Now, I am adding the animation to the currentl modalpopup as below :
<asp:modalpopupextender ID="ModalPopupExtender1" runat="server"
backgroundcssclass="ModalPopupBG" cancelcontrolid="btnCancel" drag="true"
popupcontrolid="popupPanel" popupdraghandlecontrolid="PopupHeader"
targetcontrolid="btnAddNew">
<Animations>
<OnShown>
<Fadein />
</OnShown>
<OnHiding>
<Fadeout />
</OnHiding>
</Animations>
</asp:modalpopupextender>
The <Animation> .... part is the newly added tag, and i notice that after adding it the modalpopup no longer function. When i check from Chrome developer tool, it shows "Uncaught TypeError: Cannot call method 'remove_ended' of null" which is cause by a webresourse.axd file