Gets a value indicating whether the event was handled.
Returns
true to bypass the control's default handling; otherwise, false to also pass the event along to the default control handler.
Remarks
handled is implemented differently by different controls within xtd.forms. For controls like text_box which subclass native Win32 controls, it is interpreted to mean that the key message should not be passed to the underlying native control. If you set handled to true on a text_box, that control will not pass the key press events to the underlying Win32 text box control, but it will still display the characters that the user typed.