Hello Tom Chien,
Thank you for contacting us.
In order to demonstrate the desired behavior of the radComboBox I have prepared a sample project. The radComboBox is bound to a database and the FormatString property is set to "T"
. Please, have a look at the attached file.
The easiest way to change the FormatString is to select the FormatSrting property in Design Time and click the button that will appear on the right. It opens a Format String Dialog which previews the FormatStrings. You can find more information on the FormatString topic here
. The purpose of DisplayMember and ValueMember properties is briefly explained in this article
. I hope this is helpful. If you encounter any difficulties setting your radComboBox, please let me know. I will be glad to assist you.
the Telerik team