RadChart for WPF will not allow saving to an image in this scenario.RadChart for winforms would require minimum effort on your side -- it exists in a stand-alone assembly, while RadChart for ASP.NET AJAX is in Telerik.Web.UI assembly, which contains the entire suite. You will only need to add reference to the System.Windows.Forms and Telerik.WinForms.RadChart assemblies.
RadChart for WPF will not allow saving to an image in this scenario.
Hope this helps.
the Telerik team