Using JQuery unable to access code behind functions

Using JQuery unable to access code behind functions

Hi,
I am new to Jquery
Please help me.I am trying to access the function in server side on click of my button but its not working.
I am using

http://jqueryui.com/demos/dialog/

I have to implement a search functionality inside a modal.

This is my Div

<div id="dialog_test" class="divSearchDialog" style="display: none" >
        <table width="100%" id="tblSearch" class="tblDragSearch">
            <tr>
                <td>
                    <cm:CMWLabel ID="CMWLabel1" runat="server" Text="Advanced Search" SkinID="NoStyle"
                        CssClass="divSearch_headings"></cmw:CMWLabel>
                </td>
                <td class="tdSearchClose">
                    <div class="imgSearchClose">
                        <div id="close">
                        </div>
                    </div>
                </td>
            </tr>
        </table>
       <asp:UpdatePanel ID="upsearch" runat="server">          
          
            <ContentTemplate>
                <cm:CMWButton ID="btnTest" runat="server" Text="Test" CausesValidation="false"  OnClientClick="btn_Click"    />
            </ContentTemplate>
            <Triggers>
                <asp:PostBackTrigger ControlID="btnTest" />
            </Triggers>
          
        </asp:UpdatePanel>
    </div>

When I hit button inside my modal if dosnt call the function
OnClientClick="btn_Click"  .
Please help