Can't Get AsyncFileUpload To Work In Update Panel

I have a user control with a updatepanel, script manager and a asyncfileupload control.

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:ScriptManager ID="ScriptManager2" runat="server" ></asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<cc1:AsyncFileUpload ID="AsyncFileUpload2" runat="server" />
<asp:LinkButton id="lbSubmitOrder" runat="server" title="Submit Order Request" class="btn_blue_dynamic_med"/>
</ContentTemplate>
</asp:UpdatePanel>

In my code behind:

Dim path As String = Server.MapPath("~/temp/test.tmp")
AsyncFileUpload2.SaveAs(path)

In my AsyncFileUpload2 object the filename is nothing. I can't seem to get a refernce to the file that is supposed to be uploaded.

-Nate
UPDATE
I've added
Private Sub AsyncFileUpload1_UploadedComplete(ByVal sender As Object, ByVal e As AjaxControlToolkit.AsyncFileUploadEventArgs) Handles AsyncFileUpload1.UploadedComplete
If e.state = AjaxControlToolkit.AsyncFileUploadState.Success Then
'....'
Else
showErrorMessage(e)
End If
End Sub

I can't hit a break point at the "if" statement after I choose a file. I guess there is something wrong on my page with how ajax is working? Not sure what it is though. I was displaying the ajax upload box via a radio button with a visible=true/false div. The answer told me that the control has to be there the page loads. I took away the div and everything worked! I will now do the show/hide through jquery (which I should have done in the first place).