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Gets or sets the action to perform when the DOWN ARROW key is pressed.
public InputKeyAction KeyActionDownArrow { get; set; }
Public Property KeyActionDownArrow As InputKeyAction
The default setting for this property is "InputKeyAction.ChangeSelectionOnly", which causes the control to change the selection item while keeping the listbox closed. Alternatively, you can set this to "InputKeyAction.OpenDropdown" to open the listbox without changing the current selection.