RadComboBox is fully navigable using the keyboard. You can navigate to a combobox instance using the Tab key if you set the TabIndex property of RadComboBox. In addition, you can use a shortcut if you set the AccessKey property. In this particular example, the TabIndex was set to 1 (first tab stop) and AccessKey is "T", meaning the combobox should receive focus when users press Alt+T. Once the combobox is focus, you can open the dropdown using Alt + DownArrow. Alt + UpArrow closes the dropdown. Once the dropdown is opened you can navigate the items using arrow keys and select an item using Space or Enter.