GoDiagram by Northwoods Software

GoXam Samples - Silverlight and WPF

The GoXam kits include the full C# and XAML source to all 27 of these sample applications.

Silverlight samples

Silverlight online samples opens new page
(for either Silverlight 3 or 4; in IE, Firefox, Safari and Chrome)
WPF

WPF samples in an XBAP application opens new page
(IE with .NET 3.5 or 4.0 installed on PC, or Firefox if WPF enabled in Tools > Add-ons: Plugins)

You can use these samples as the starting point for your application.