Programmatically show hide AJAX "PopupControlExtender"

in aspx page 

<asp:Panel ID="divPopup" runat="server" CssClass="DivPopup"></asp:Panel>
   <ajaxToolkit:PopupControlExtender ID="PopupExtndr" runat="server" PopupControlID="divPopup"  TargetControlID="fakeButton"    BehaviorID="popupBhvr">

use following javascript syntax to show hide PopupControlExtender:

 $find('popupBhvrPopupBehavior').hide();
 $find('popupBhvr').showPopup();
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