Button on usercontroll doesn't fire / raise event

Question

i have a usercontroll with two buttons and i want to get the raiseevent in the page where i call the usercontrol. Everything works fine except that i can't catch the event when i click the button on the user contol.

my markup for the uc:

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="MsgBox.ascx.vb" Inherits="MsgBox" ClassName="MsgBox" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="act" %>
<style type="text/css">
    .Modal_trans {
        opacity: 0.8;
        filter: alpha(opacity=60);
    }
</style>
<link rel="stylesheet" type="text/css" href="../Styles/StyleSheet.css" />"
<asp:Panel ID="PopPanel" runat="server" 
    Width="500px" Height="50px" DefaultButton="ok" Style="overflow:hidden;" CssClass="ModalGrid">
    <table style="width: 100%; border-collapse: collapse; border: 0px;">
        <tr id="boxheader" runat="server" style="cursor: move;">
            <th colspan="2" style="padding-left: 10px; padding-top: 3px; padding-bottom: 3px;">
                <asp:Label ID="lblTitle" runat="server" Text="Help"></asp:Label>
            </th>
        </tr>
        <tr>
            <td>
                <asp:Image ID="Image" runat="server" ImageUrl="../images/info.png" />
            </td>
            <td style="padding: 10px; width: 220px;">
                <div style="width: 295px; height:70px;"">
                    <asp:Label ID="lblMsg" runat="server" BackColor="#CCCCCC"  />
                </div>
            </td>
        </tr>
        <tr>
            <th colspan="2" style="padding-right: 20px; padding-top: 7px; padding-bottom: 7px;"" >
                <asp:LinkButton ID="LinkButton1" runat="server" Style="display:none" ></asp:LinkButton>
                <asp:Button ID="ok" runat="server" Text="Ok" Width="80px"  />
                <asp:Button ID="no" runat="server" Text="No / Cancel" Width="80px" Visible="False" />
            </th>
        </tr>
    </table>
</asp:Panel>
<act:ModalPopupExtender ID="PopUp" runat="server" Enabled="True"
    PopupControlID="PopPanel" TargetControlID="LinkButton1" BackgroundCssClass="Modal_trans"
    OkControlID="ok" PopupDragHandleControlID="boxheader" Y="0" DropShadow="True">
    <Animations>
        <OnShown>
            <Sequence AnimationTarget="PopPanel">
                <Parallel Duration=".5" Fps="25">
                    <Move Horizontal="-175" Vertical="200" />
                    <Resize Width="350" Height="142"/>
                    <FadeIn />
                </Parallel>
            </Sequence>
        </OnShown>
        <OnHiding>
            <Sequence AnimationTarget="PopPanel">
                <%-- Scale the flyout down to 5% to make it disappear --%>
                <Parallel Duration=".75" Fps="25">
                    <Scale ScaleFactor="0.05" Center="true" ScaleFont="true" FontUnit="px" />
                    <FadeOut />
                </Parallel>
                <%-- Reset the styles on the info box --%>
                <StyleAction Attribute="display" Value="none"/>
                <StyleAction Attribute="width" Value="350px"/>
                <StyleAction Attribute="height" Value=""/>
                <StyleAction Attribute="fontSize" Value="12px"/>
                <%-- Re-enable the button --%>
                <EnableAction Enabled="true" AnimationTarget="ok" />
            </Sequence>
        </OnHiding>
    </Animations>
</act:ModalPopupExtender>

and the code behind

    Partial Class MsgBox
    Inherits System.Web.UI.UserControl
    Public Shared IconInfo, IconExec, IconQues, IconError As Object
    Public Property MsgText As String
        Get
            Return lblMsg.Text
        End Get
        Set(ByVal value As String)
            lblMsg.Text = value
        End Set
    End Property
    Public Event MsgButtonClick(ByVal buttonName As String)
    Protected Sub MsgButtonOKClick(ByVal sender As Object, ByVal e As EventArgs) Handles ok.Click
        RaiseEvent MsgButtonClick("ok")
    End Sub
    Protected Sub MsgButtonDenyClick(ByVal sender As Object, ByVal e As EventArgs) Handles no.Click
        RaiseEvent MsgButtonClick("no")
    End Sub
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        IconInfo = "Show Information Icon"
        IconExec = "Show Warning Icon"
        IconQues = "Show Question Icon"
        IconError = "Show Error Icon"
    End Sub
    Public Sub Pop(Optional ByVal Message As String = "", Optional ByVal Mode As Object = "IconInfo", Optional ByVal Title As String = "Info Message")

        no.Visible = False
        ok.Text = "Ok"

        If Title <> "" Then
            lblTitle.Text = Title
        End If

        Select Case Mode
            Case "IconInfo"
                Image.ImageUrl = "../images/info.png"
                no.Visible = False
                ok.Text = "Ok"
                lblTitle.Text = "Info"
            Case "IconExec"
                Image.ImageUrl = "../images/exc.png"
                no.Visible = False
                ok.Text = "Ok"
                lblTitle.Text = "Warning"
            Case "IconQues"
                Image.ImageUrl = "../images/ques.png"
                no.Visible = True
                ok.Text = "Yes"                    lblTitle.Text = "Question"
            Case "IconError"
                Image.ImageUrl = "../images/error.png"
                no.Visible = False
                ok.Text = "Ok"
                lblTitle.Text = "Error"
        End Select

        PopUp.Show()
    End Sub

    Protected Sub No_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles no.Click
        PopUp.Hide()
    End Sub

Tested also with the variation

    Public Event MsgButtonClick As EventHandler
Protected Sub MsgButtonOKClick(ByVal sender As Object, ByVal e As EventArgs) Handles ok.Click
    RaiseEvent MsgButtonClick(sender, e)
End Sub
Protected Sub MsgButtonDenyClick(ByVal sender As Object, ByVal e As EventArgs) Handles no.Click
    RaiseEvent MsgButtonClick(sender, e)
End Sub

In my page, it's a contetpage of a master page with update panel i try to catch the event with following in the code behind

Protected Sub test() Handles PopMsg.MsgButtonClick
    Response.Write("Done")
End Sub

In the markup on the page i have placed the controldirectly behind the ContentTemplate of the UpdatePanel

<msg:PopInfoMsg ID="PopMsg" runat="server" />

And call the UC with a button click

Protected Sub HelpMsg()
    PopMsg.MsgText = "My first Test<br/> Cheers<br/>"
    PopMsg.Pop("", "IconInfo", "Info")
End Sub

The control open as expected, but when clicking the "OK" button the control close without an event. In VS i tried to debug at the Button Click but the code doesn't run to this point. Where i'am wrong? Confusing me the last days...

Cheers, Alex