The MoveTo method can be used to move to a particular step programmatically. The method's prototype is as follows:
It happens when your page code references a ScriptManager but your Page or MasterPage does not have it referenced, therefore just add:
<ASP:ScriptManager ID="SM1" runat="server />
public static T FindControl<T>(this Control control, string controlId) where T : Control
{
return (T)control.FindControl(controlId);
}