how to use fileupload control inside ajaxtab container

how to use fileupload control inside ajaxtab containerin asp.net c#

<div class="form_row"><label class="login">
                        Photo</label><asp:FileUpload ID="FileUploadPhoto" runat="server" /><br /></div><asp:Panel ID="PanelPreview" runat="server" Width="379px"><div class="form_row"><asp:Button ID="btnUpload" runat="server" Text="Preview" OnClick="btnUpload_Click" /><br /><br /></div></asp:Panel><asp:Panel ID="PanelPhoto" runat="server" Width="378px"><div class="form_row"><asp:Image ID="ImagePhoto" runat="server" Height="150px" Width="120px" /></div></asp:Panel><cc1:CollapsiblePanelExtender ID="PanelPhoto_CollapsiblePanelExtender"
                    runat="server" CollapseControlID="PanelPreview" Collapsed="True" Enabled="True"
                    ExpandControlID="PanelPreview" TargetControlID="PanelPhoto"></cc1:CollapsiblePanelExtender>