Javascript:Confirm button

[JMvVliet]

I've got a question: the following ASP.NET code works fully in my testproject. When I click my htmlbutton (defined protected withevents, not seeable in the code), I get a messagebox asking me what to do. Clicking yes fires the htmlbutton event, clicking no ignores it.

This is the code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
 
        With btn
            .InnerText = "Apply"
            .ID = "Button1"
            '.Attributes.Add("runat", "server")
            .Visible = True
        End With
 
        Me.Controls.Add(btn)
        btn.Attributes.Add("OnClick", "javascript:if(confirm('Are you sure?') == false) return false;")
    End Sub
 
    Private Sub btn_ServerClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles btn.ServerClick
        Response.Write("OK")
    End Sub

The problem is that I can't get it to work in my real project. The confirm message is shown, if I click cancel nothing happens, and if I click ok, something happens, but the underlying event is not fired.

Could it be that the button is added to a placeholder control dynamically? Or that the button is placed within a table?

Hope anyone could help, thanx in advance,

JMvVliet