I have a label in my update panel that I want to update its text on after a successful asynchronus file upload. Here's my markup:

<asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate>
Step 1 (<asp:Label ID="label_fileupload" runat="server" />):
<br />
<ajaxToolkit:AsyncFileUpload ID="AsyncFileUpload1" Width="200px" runat="server" 
CompleteBackColor="Lime" UploaderStyle="Modern" ErrorBackColor="Red" ThrobberID="Throbber" 
UploadingBackColor="#66CCFF" OnClientUploadStarted="StartUpload" />
<asp:Label ID="Throbber" runat="server" Style="display: none"><img src="/images/indicator.gif" alt="loading" /></asp:Label>
<br />
<asp:Label ID="statuslabel" runat="server" Text="Label"></asp:Label>
</ContentTemplate></asp:UpdatePanel>

Here is my code-behind:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If (IsPostBack) Then

    Else
        label_fileupload.Text = "Incomplete"
        label_fileupload.CssClass = "uploadincomplete"
        statuslabel.Text = "NOT DONE"
    End If
End Sub

Public Sub AsyncFileUpload1_UploadedComplete1(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
    System.Threading.Thread.Sleep(1000)
    If (AsyncFileUpload1.HasFile) Then
        Dim strPath As String = MapPath("/images/White.png")
        AsyncFileUpload1.SaveAs(strPath)
    End If

    label_fileupload.Text = "Complete"
    label_fileupload.CssClass = "uploadcomplete"
    statuslabel.Text = "DONE"
End Sub

When I set the labels to update via a button click, they work. But when I set them to update via the Upload complete event, they don't work.

Is there some way around this to get the labels to update their text / css class from the UploadedComplete event of an asynchronous file upload control?