Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\event\EventUtil.java

/*
 * Copyright (c) 2011, 2013, 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.event;

import java.util.concurrent.atomic.AtomicBoolean;

import javafx.event.Event;
import javafx.event.EventDispatchChain;
import javafx.event.EventTarget;

public final class EventUtil {
    private static final EventDispatchChainImpl eventDispatchChain =
            new EventDispatchChainImpl();

private static final AtomicBoolean eventDispatchChainInUse =
            new AtomicBoolean();

public static Event fireEvent(EventTarget eventTarget, Event event) {
        if (event.getTarget() != eventTarget) {
            event = event.copyFor(event.getSource(), eventTarget);
        }

if (eventDispatchChainInUse.getAndSet(true)) {
            // the member event dispatch chain is in use currently, we need to
            // create a new instance for this call
            return fireEventImpl(new EventDispatchChainImpl(),
                                 eventTarget, event);
        }

try {
            return fireEventImpl(eventDispatchChain, eventTarget, event);
        } finally {
            // need to do reset after use to remove references to event
            // dispatchers from the chain
            eventDispatchChain.reset();
            eventDispatchChainInUse.set(false);
        }
    }

public static Event fireEvent(Event event, EventTarget... eventTargets) {
        return fireEventImpl(new EventDispatchTreeImpl(),
                             new CompositeEventTargetImpl(eventTargets),
                             event);
    }

private static Event fireEventImpl(EventDispatchChain eventDispatchChain,
                                       EventTarget eventTarget,
                                       Event event) {
        final EventDispatchChain targetDispatchChain =
                eventTarget.buildEventDispatchChain(eventDispatchChain);
        return targetDispatchChain.dispatchEvent(event);
    }
}

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