<asp:Content id="cnt_Content" ContentPlaceHolderID="contentBlock" Runat="Server">
    <%-- CONTENT --%>
    <div id="formWrapper">
        <asp:UpdatePanel id="upl_Content" runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <fieldset class ="aspUpdatePanel sidePadd">
                    ...
                </fieldset>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>
</asp:Content>

<asp:Content id="cnt_ActionBar" ContentPlaceHolderID="actionBlock" runat="server">
    <%-- ACTION BAR --%>
    <asp:UpdatePanel id="upl_Action" runat="server">
        <ContentTemplate>
            <table class="actionBlock" cellpadding="0" cellspacing="0">
                <tr>
                    <td class="centered"><asp:Button id="search" runat="server" ... />...<asp:Button id="close" runat="server" ... /></td>
                </tr>
            </table>
        </ContentTemplate>
    </asp:UpdatePanel>

    <%-- SEARCH DIALOG --%>
    <eo:CallbackPanel id="cbp_Dialog" runat="server" Triggers="{ControlID:dlg_Search;Parameter:}" UpdateMode="Self">                               
        <eo:Dialog id="dlg_Search" runat="server" ShowButton="search" AcceptButton="goSearch" CancelButton="cancel" AcceptButtonPostBack="true" >
            <ContentTemplate>
                <table class="msgBoxBody" cellspacing="0" cellpadding="0">
                    <tr>
                        <td><asp:Image id="DocSearch" runat="server" ImageUrl="~/..." /></td>
                        <td>
                            <div>Enter Employee Name of part of it:</div>
                            <asp:TextBox id="searchInput" runat="server" CssClass="aspTextBox width200" ></asp:TextBox>
                        </td>
                    </tr>
                </table>
            </ContentTemplate>
            <FooterTemplate>
                <div class="msgBoxFooter">
                    <asp:Button id="goSearch" runat="server" Text="Search" CssClass="msgBoxButton" /><asp:Button id="cancel" runat="server" Text="Cancel" CssClass="msgBoxButton" />
                </div>            
            </FooterTemplate>                
        </eo:Dialog>         
    </eo:CallbackPanel>                           
</asp:Content>

Protected Sub GoSearch(ByVal sender As Object, ByVal e As EventArgs) Handles goSearch.Click
     ' works
     Dim searchValue As String = searchInput.Text
     MsgBox("I have been fired... Captured Search value = [" & searchValue & "]")

     ' doesn't work - no action
     txt_Comments.Text = "hello world"
     txt_Comments.Focus()
     upl_Content.Update()

     ' doesn't work - no action
     txt_Comments.Text = "I have been fired."
     upl_Content.Update()

     ' doesn't work - no action
     txt_Temp.Text = "Entered value = " & searchValue
     upl_Temp.Update()

     ' doesn't work - no action
     If searchValue IsNot Nothing Then FindEmployee(searchValue)

End Sub