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Known Issues
This article lists known issues and limitations of the RadProgressBar control.
Duplicate Component Registration After AJAX Request With asp:ScriptManager
Error: Error: Sys.InvalidOperationException: Two components with the same id 'RadProgressBar1' can't be added to the application.
.
Workaround: Use <telerik:RadScriptManager>
instead of <asp:ScriptManager>
ASP.NET
<%--<asp:ScriptManager ID="Scriptmanager1" runat="server" />--%> <-- issue
<telerik:RadScriptManager runat="server" ID="RadScriptManager1"></telerik:RadScriptManager> <-- workaround
<asp:UpdatePanel ID="Updatepanel1" runat="server">
<ContentTemplate>
<asp:Button ID="Button1" Text="AJAX" runat="server" />
<telerik:RadProgressBar runat="server" ID="RadProgressBar1" />
</ContentTemplate>
</asp:UpdatePanel>
Bug fix status: https://feedback.telerik.com/Project/108/Feedback/Details/212449.