RadTabControl takes a full advantage of the DataBinding in Silverlight.
Use DataContext to provide data for data binding. Read more here.
Use data binding to bind a property to an object’s value.
Use data binding to bind the RadTabControl to a collection, in order to create tabs dynamically on the basis of the collection items. Read more here.
Use the TwoWay data binding mode, so you can provide interaction between the RadTabControl and the bound object.
Use DataBinding in combination with converter so you can easily adjust the value to your needs.