/// <summary>
 /// Constructor.
 /// </summary>
 public KeyboardButtonMessage(XKeys keyData, ButtonActions buttonAction)
 {
     _buttonAction   = buttonAction;
     _buttonShortcut = new KeyboardButtonShortcut(keyData);
 }
 /// <summary>
 /// Constructor.
 /// </summary>
 public KeyboardButtonDownPreview(XKeys keyData)
 {
     _buttonShortcut = new KeyboardButtonShortcut(keyData);
 }