Thank you for contacting us.
The RadComboBox has the same SelectionChanged
event. So, the code is exactly the same for RadComboBox as the one you pasted.
Could you please share with us what difficulties do you experience with RadComboBox? For more information you can refer to our online documentation: http://www.telerik.com/help/silverlight/radcombobox-getting-started.html
the Telerik team
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