Adding to above question, I cannot determine the columns at compile time as i am planning to reusing telerik grid so at run time i have to determine the number of columns and bind combobox kind of thing to some columns.
Thank you for contacting us and sorry for the late response.
I have attached a basic example of using a ComboBoxColumn. Also, you can take a look at our online help where all the supported scenarios are explained with a sample code.
Please, let me know should you need further assistance.