Thanks for reply
Mentioned properties i have already set.
Refer Below Code:
<asp:Panel ID="pnlreopen" runat="server" CssClass="modalPopup" Style="width: 250px;
display: none;">
<table width="350px" style="border-style: solid; border-width: thin;">
<tr>
<td valign="top" align="left" class="lbl">
<asp:Label ID="Label2" runat="server" Text="Issue Description :"></asp:Label>
</td>
<td align="left" valign="top">
<asp:TextBox ID="txtissue_desc" runat="server" Height="50px" TextMode="MultiLine"
Enabled="true" Width="250px"></asp:TextBox>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:Button ID="btnreopen" runat="server" Text="Reopen" Font-Names="Verdana" />
<asp:Button ID="btncancel" runat="server" Text="Reset" Font-Names="Verdana" />
</td>
</tr>
</table>
</asp:Panel>
<asp:ModalPopupExtender ID="ModalPopupExtender2" runat="server" TargetControlID="HiddenField2"
PopupControlID="pnlreopen" BehaviorID="B2" DropShadow="true">
</asp:ModalPopupExtender>
<pre lang="C++"><asp:HiddenField ID="HiddenField2" runat="server" />
and from code behind on button click i am calling it as:
ModalPopupExtender2.Show()
I have not added properties CancelcontrolId because it is not required.
I am checking in IE 8.0. Can there by any version conflict of IE.