Dynamic link button not firing in update panel
<p>I'm dynamically adding a link button in the footer of a grid view.  The grid view is wrapped in an update panel.  I can get an async post back (I can tell by seeing an update progress flash), but I can't get the debug point in my click function to fire.</p>

<pre><code>Private Sub gvParts_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvParts.RowDataBound
 ElseIf e.Row.RowType = DataControlRowType.Footer Then
        If _showPrice Then

            Dim clearbutton As New LinkButton
            clearbutton.ID = "btnClearCart"
            clearbutton.Text = "Remove All"

            ScriptManager1.RegisterAsyncPostBackControl(clearbutton)
            e.Row.Cells(7).Controls.Add(clearbutton)

            AddHandler clearbutton.Command, AddressOf clearButton_click

        End If
    End If

Private Sub clearButton_click(ByVal sender As Object, ByVal e As System.EventArgs)
    ClearCart()
End Sub
</code></pre>
