'KendoNumericTextBox' could not be found

I'm trying to create a test that enters a value into a Kendo Numeric Text Box. However, if I attempt to use the code provided below, compilation for the test fails, giving the error " The type or namespace name 'KendoNumericTextBox' could not be found (are you missing a using directive or an assembly reference?)". I've already confirmed that the Telerik.TestingFramework.Controls.KendoUI dll is referenced by the project in the project settings. How can I interact with the numeric text box?

Thanks

 http://www.telerik.com/forums/kendo-numeric-text-box