The keyboard navigation of the ComboBox is always available.
The ComboBox supports the following keyboard shortcuts:
Alt & Down Arrow
|Opens the popup.
Alt & Up Arrow or
|Closes the popup.
|Resets the value when Popup is closed.
|Selects the next available item. Highlights it only if the popup is open.
|Selects the previous available item. Highlights it only if the popup is open.
|Moves cursor to the beginning of the input.
|Moves cursor to the end of the input.
|Scrolls the popup list up.
|Scrolls the popup list down.