I used the code snippets provided to create a test page.
There are two changes that I made at OnItemsRequested event handler - at first I cleared the Items collection of the RadComboBox, and then I changed the items generation logic.
Please note that the values of RadComboBox items have to be unique
sender, RadComboBoxItemsRequestedEventArgs e)
i = 0; i < 10; i++)
After tests performed I can say that RadComboBox control behaves correctly on my side - please take a look at this demonstration video
Let me suggest you find the sample page attached and give it a try with our latest version (Telerik.Web.UI 2010.2.713).
All the best,
the Telerik team
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