I'm trying to add one test control on the server side to my WebDialogWindow and am having no luck.  I'm handling the "showing" of the modal on a Row Command event from a grid view.  Here are the relavent bits:

{BUTTON on Grid}

    <asp:ImageButton ID="GridBtn"
    runat="server"
    CommandArgument='<%#Eval("MajorBrainstormID") %>'
    CommandName="display"
    ImageUrl="~/img/blankgrid.png" />

 {CODE}

    Public Sub BrainstormGrid_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs) Handles PriorityGrid.RowCommand
        If (e.CommandName = "display") Then
            Dim btn As New Label
            btn.Text = "test"

            Dim dialog As WebDialogWindow = TryCast(PriorityGridModal, WebDialogWindow)

            With dialog
                .ContentPane.Controls.Add(btn)
                .WindowState = Infragistics.Web.UI.LayoutControls.DialogWindowState.Normal
            End With

            gridUpdatePanel.Update()

        End If
    End Sub

{CONTROL on .aspx page}

        <asp:UpdatePanel runat="server" ID="gridUpdatePanel" UpdateMode="Conditional">
            <ContentTemplate>
                <ig:WebDialogWindow
                    ID="PriorityGridModal"
                    runat="server"
                    Height="300px"
                    Width="400px" Modal="True"
                    Moveable="true"
                    Top="0px"
                    Left="0px"
                    WindowState="Hidden"
                    CssClass="modalContainer"
                    >
                    <ContentPane>
                        <Template>
                                                                           
                        </Template>
                    </ContentPane>
                </ig:WebDialogWindow> 
            </ContentTemplate>
        </asp:UpdatePanel>

The DialogWindow displays just fine, but it is empty.  Can't seem to work out why.  I'm not getting any errors, and I've stepped through the execution and everything is firing as expected.  What am I missing?