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Gets or sets the action to perform when the UP ARROW key is pressed.
public InputKeyAction KeyActionUpArrow { get; set; }
Public Property KeyActionUpArrow 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.