radprogressArea does not show up every time

   <asp:Panel ID="pnlUpload" runat="server">
    <telerik:RadUpload ID="RadUpload1" runat="server" Skin="Vista" FocusOnLoad="true"
     InputSize="60" InitialFileInputsCount="1" ReadOnlyFileInputs="true"
     Font-Names="Verdana" ControlObjectsVisibility="None">
     <Localization Select="Choose File" />
    </telerik:RadUpload>
    <asp:Button ID="btnUpload" Text="OK - Upload" runat="server" Font-Names="Verdana"
     Font-Size="Smaller" />
    <asp:Button ID="btnClose" Text="Close" runat="server" Font-Names="Verdana"
     Font-Size="Smaller" OnClientClick="CloseWindow()" />
   </asp:Panel>
   <telerik:RadProgressManager ID="RadProgressManager1" runat="server" />
   <div style="position: absolute; top: 10px; left: 10px; background-color:Navy">
    <telerik:RadProgressArea ID="RadProgressArea1" runat="server" DisplayCancelButton="True" Font-Size="Smaller"
     Skin="Vista">
     <Localization Uploaded="Uploaded">
     </Localization>
    </telerik:RadProgressArea>
   </div>