UpdateProgress Manual Control from CodeBehind

I have an UpdateProgress that appears when submitting but I want to use the same UpdateProgress to activate it manually for other reasons for events that happen inside or outside the updatepanel.This way, I don't need to have two cursor controls for the same page.

How do you do it from codebehind?

<asp:UpdateProgress ID="Form_UpdateProgress" DynamicLayout="true" runat="server" AssociatedUpdatePanelID="Form_UpdatePanel">
<ProgressTemplate>
<div class="loaderDer">
<div class="loaderDercenter">
<asp:Image ID="Form_ImageProgress" runat="server" ImageUrl="../images/loader.gif"/>
</div>
</div>
</ProgressTemplate>
</asp:UpdateProgress>

<asp:updatepanel ID="Form_UpdatePanel" runat="server">
<ContentTemplate>...