In the 2011.Q3 release we introduced a new gauge control. It is almost new control designed from scratch. Some of its features are similar to the old control’s features but they are implemented in completely different way (using different set of properties), some features are completely new.
Our demo application now references the new gauge control and demonstrates its features. You can look how to create the semicircle gauge of new gauge control using the following link: http://demos.telerik.com/silverlight/#Gauge/Customization/HalfCircleGauges
Note, you should add the reference on the Telerik.Windows.Controls.DataVisualization.dll in your project for using the new gauge control. Also its elements use the Telerik.Windows.Controls.Gauge namespace.
We are working on the help topics so they describe features of the new control as well. We strongly recommend using the new gauge control in the new applications. To avoid cross-controls problems we’ve removed old control from the default Telerik namespace. But it still can be used in your XAML when you specify prefixes to its namespaces as following: