Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\traversal\ParentTraversalEngine.java

/*
 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package com.sun.javafx.scene.traversal;

import javafx.scene.Parent;

/**
 * This traversal engine can be used to change algorithm for some specific parent/control that needs different traversal.
 * This can be achieved by setting such engine using {@link Parent#setImpl_traversalEngine(ParentTraversalEngine)}
 * and providing a special Algorithm implementation.
 *
 * Alternatively, the traversal engine can be w/o an algorithm and used just for listening to focus changes inside the specified parent.
 */
public final class ParentTraversalEngine extends TraversalEngine{

private final Parent root;
    private Boolean overridenTraversability;

public ParentTraversalEngine(Parent root, Algorithm algorithm) {
        super(algorithm);
        this.root = root;
    }

public ParentTraversalEngine(Parent root) {
        super();
        this.root = root;
    }

/**
     * @param value overridden value or null for default value
     */
    public void setOverriddenFocusTraversability(Boolean value) {
        overridenTraversability = value;
    }

@Override
    protected Parent getRoot() {
        return root;
    }

public boolean isParentTraversable() {
        // This means the traversability can be overriden only for traversable root.
        // If user explicitly disabled traversability, we don't set it back to true
        return overridenTraversability != null ? root.isFocusTraversable() && overridenTraversability : root.isFocusTraversable();
    }

}

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