ComponentOne Xamarin Edition
Keyboard Navigation
Controls > Input > ComboBox > Features > Keyboard Navigation

ComboBox provides keyboard support that can be used to navigate through the drop down list. The keyboard navigation keys can replace the use of mouse by allowing you to edit and navigate through the drop down list. The keys and their corresponding actions are listed below:

Keys Actions
Arrow Up and Down Navigates through the list of items in the drop down. If drop down isn't open, it remains hidden but the next item is selected.
Enter Begins/Ends editing, selects the highlighted item, and hides the drop down
Esc Hides the drop down
Tab Jumps between different controls on the platforms that support tab stops (UWP)