Ingen handler

Har lavet følgende men knappen vises kun første gang hvorfor det?

  Public Sub createlb()
    Dim lb As New LinkButton
    lb.ID = "knap"
    lb.Text = "Tryk her"
    AddHandler lb.Click, AddressOf lb_click
    PlaceHolder1.Controls.Add(lb)
End Sub
  Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If Not IsPostBack Then createlb()
  End Sub
  Public Sub lb_click(ByVal sender As System.Object, ByVal e As System.EventArgs)
    createlb()
    Response.Write("Show this")
  End Sub