Take a look at the following online demo showing an application scenario for related RadComboBoxes: http://demos.telerik.com/aspnet-ajax/combobox/examples/functionality/multiplecomboboxes/defaultcs.aspx
The RadComboBoxes in the aforementioned demo are using their client as well as server API to achieve the related controls scenario. The data of the selected item in the first RadComboBoxm, and the second RadComboBox respectively, is transferred to the server via the
client method, and it is retrieved on the server by the
's Text property (see the
server event handler).
I hope this will help.
All the best,
the Telerik team
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