How to Register a postback in a RadScripManager

[Enrique Gonzalez]

How to register a postback in a RadscriptManager, to preserve the value of a FileUpload that is contained in a RadAjaxLoadingPanel.

This in an example using ScripManager and UpdatePanel:

Protected Sub BtnSubirFoto_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles BtnSubirFoto.PreRender

        Dim btn1 As Button = DirectCast(sender, Button)
        Dim rsm As RadScriptManager = DirectCast(MyMaster.FindControl("RadScriptManager1"), RadScriptManager)
        rsm.RegisterPostBackControl(btn1)

End Sub