Overriding: javafx.scene.control.Control 
 Create a new instance of the default skin for this control. This is called to create a skin for the control if
 no skin is provided via CSS  -fx-skin or set explicitly in a sub-class with   setSkin(...).
 
Returns:   new instance of default skin for this control. If null then the control will have no skin unless one
          is provided by css.
Overriding: javafx.scene.control.Control 
 Returns the initial focus traversable state of this control, for use
 by the JavaFX CSS engine to correctly set its initial value. This method
 is overridden as by default UI controls have focus traversable set to true,
 but that is not appropriate for this control.
Returns:  the initial focus traversable state of this control
Since:  9