how to use more than one modalpopupextender on same page ?

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C#3.5

Ajax-toolkit

I want to use modalpopextender in c# , when i click on edit button of grd it will call grd_RowCommand() , then it should show ModalPopUpExtender1 , if i click on edit button of repeter it will call repeter _ItemCommand() , then it should show ModalPopUpExtender2 .
Can anyone help me.

<asp:ImageButton ID="grd_imgFake" runat="server" />
<ajaxTool:ModalPopupExtender ID="ModalPopupExtender1"  runat="server" BackgroundCssClass="modalBackground" TargetControlID="grd_imgFake" PopupControlID="grd_panelModalPopup" BehaviorID="grd_panelModalPopup" Enabled="true" CancelControlID="grd_imgCancel"></ajaxTool:ModalPopupExtender>
<asp:Panel ID="grd_panelModalPopup" runat="server" CssClass="modalPopup" Visible="False">
<asp:ImageButton ID="grd_imgCancel" runat="server" ImageAlign="Right" /></asp:Panel>

 <asp:ImageButton ID="repeter_imgFake" runat="server" />
 <ajaxTool:ModalPopupExtender ID="aModalPopupExtender2"  runat="server" BackgroundCssClass="modalBackground" TargetControlID="repeter_imgFake" PopupControlID="repeter_panel" BehaviorID="repeter_panel" Enabled="true" CancelControlID="repeter_imgCancel"></ajaxTool:ModalPopupExtender>
<asp:Panel ID="repeter_panel" runat="server" CssClass="modalPopup" Visible="False">
      <asp:Label ID="lbl" runat="server" Text="accounting"></asp:Label>
     <asp:ImageButton ID="repeter_imgCancel" runat="server" ImageAlign="Right" />
</asp:Panel>

i have used thses but its not working , it just showing ModalPopUpExtender2 .