I have a button on which I am calling a modal pop up extender which is showing a panel. Below is the code:

```
<asp:Button ID="btnOne" runat="server" Text="View " 
                                onclick=" btnOne_Click" />

<asp:Panel ID="test" CssClass="ModalWindow"  Width="100%"  ScrollBars="Both" runat="server">
          <table id="tblgv" width="100%">
            <tr>
                <td>
                    <asp:GridView ID="gvTwo" runat="server">
                    </asp:GridView>
                </td>
            </tr>
             <tr>
                <td>
                <asp:Button ID="btnPopUpCancel" runat="server" Text="Close" />
                </td>
            </tr>
          </table>
        </asp:Panel>

<asp:ModalPopupExtender ID="ModalPopupExtender1"  OkControlID="btnPopUpCancel" 
  TargetControlID=" btnOne " PopupControlID="test" runat="server">
</asp:ModalPopupExtender>

```

In the panel, I have a gridview. I want that when I click the button gridview will be loaded. But it is not happening, when I clicked on the button it is not going server side.

help me how to resolve it.