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.ButtonBase

Toggles the state of the CheckBox. If allowIndeterminate is true, then each invocation of this function will advance the CheckBox through the states checked, unchecked, and undefined. If allowIndeterminate is false, then the CheckBox will only cycle through the checked and unchecked states, and forcing indeterminate to equal to false.

Overriding: javafx.scene.control.Control

This method is called by the assistive technology to request the value for an attribute.

This method is commonly overridden by subclasses to implement attributes that are required for a specific role.
If a particular attribute is not handled, the superclass implementation must be called.

Parameters:

attribute		the requested attribute
parameters		optional list of parameters

Returns:  the value for the requested attribute