issue in panel when using with ajax modal popup control - asp.net

Question

I have 2 panels and using ajax modalpopup control
<asp:Panel ID="pnlHead" runat="server" CssClass="modalPopup">
<asp:Panel ID="pnlBody" runat="server">
<div id="popupHead">
<div id="popup_left">
<asp:Label ID="lblProduct" runat="server"></asp:Label></div>
<!-- end banner_left -->
<div id="popup_right">
</div>
<!-- end banner_right -->
</div>
</asp:Panel>
<p>
<asp:PlaceHolder ID="phcontrol" runat="server"></asp:PlaceHolder>
</p>
<div>
<center>
<asp:ImageButton ID="imgbtnOk" runat="server" OnClick="imgbtnOk_Click" />
</center>
</div>
</asp:Panel>
<asp:Panel ID="pnlHeadWD" runat="server" CssClass="modalPopupWD"
BackImageUrl="~/WebSiteContent/Images/Cloud.JPG">
<asp:Panel ID="pnlBodyWD" runat="server">
<div id="Div1" style="position: absolute; left: 15%; top: 15%; vertical-align: middle;">
<br />
<br />
<br />
<br />
<br />
<p>
<asp:PlaceHolder ID="phcontrolWD" runat="server"></asp:PlaceHolder>
</p>
<div>
<center>
<asp:ImageButton ID="imgbtnOkWD" runat="server" Visible="false" OnClientClick="$find('pnlHeadWD').hide(); return false;" />
</center>
</div>
</div>
</asp:Panel>
</asp:Panel>
<asp:TextBox ID="txtHidden" Visible="false" runat="server"></asp:TextBox>
<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="lblCopyright"
PopupControlID="pnlHead" BackgroundCssClass="modalBackground" DropShadow="true"
PopupDragHandleControlID="pnlBody">
</cc1:ModalPopupExtender>
<cc1:ModalPopupExtender ID="ModalPopupExtender2" runat="server" TargetControlID="lblCopyright"
BehaviorID="pnlHeadWD" PopupControlID="pnlHeadWD" BackgroundCssClass="modalBackground"
DropShadow="true" PopupDragHandleControlID="pnlBodyWD">
</cc1:ModalPopupExtender>
when I tried to call the first ModalPopupExtender1 then even the second ModalPopupExtender2 is getting executed and 2 modal popup extenders are shown.
public void Populate_Popup(String URL,String Message_Identifier)
{
this.ModalPopupExtender1.Show();
}
public void Populate_Popup2(string Message)
{
this.ModalPopupExtender2.Show();
}

Answer 1

Your TargetControlID="lblCopyright" is the same for both ModalPopupExtenders.