RadDropDownList features keyboard support for quick item selection with the keyboard. Below are the keys and
key combinations needed to navigate the control and select a value.
Focus the control: TAB key when the control is next in the tab order.
Select previous item: up arrow or left arrow.
Select next item: down arrow or right arrow.
Select first item in the list: Home key.
Select last item in the list: End key.
Open popup: Alt + down arrow.
Close popup: Alt + up arrow or Esc key.
Select hightlighted item from the popup: Enter key.