Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\Group.java

/*
 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 */

package javafx.scene;

import javafx.beans.DefaultProperty;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.BooleanPropertyBase;
import javafx.collections.ObservableList;
import javafx.geometry.Bounds;
import java.util.Collection;

/**
 * A {@code Group} node contains an ObservableList of children that
 * are rendered in order whenever this node is rendered.
 * 
 * A {@code Group} will take on the collective bounds of its children and is
 * not directly resizable.
 * 
 * Any transform, effect, or state applied to a {@code Group} will be applied
 * to all children of that group. Such transforms and effects will NOT be included
 * in this Group's layout bounds, however if transforms and effects are set
 * directly on children of this Group, those will be included in this Group's layout bounds.
 * 
 * By default, a {@code Group} will "auto-size" its managed resizable
 * children to their preferred sizes during the layout pass to ensure that Regions
 * and Controls are sized properly as their state changes. If an application
 * needs to disable this auto-sizing behavior, then it should set {@link #autoSizeChildren}
 * to {@code false} and understand that if the preferred size of the children
 * change, they will not automatically resize (so buyer beware!).
 *
 * Group Example:
 *
<PRE>
import javafx.scene.*;
import javafx.scene.paint.*;
import javafx.scene.shape.*;
import java.lang.Math;

Group g = new Group();
for (int i = 0; i < 5; i++) {
 Rectangle r = new Rectangle();
 r.setY(i * 20);
 r.setWidth(100);
 r.setHeight(10);
 r.setFill(Color.RED);
 g.getChildren().add(r);
}
</PRE>
 * @since JavaFX 2.0
 */
@DefaultProperty("children")
public class Group extends Parent {

/**
     * Constructs a group.
     */
    public Group() { }

/**
     * Constructs a group consisting of children.
     *
     * @param children children.
     */
    public Group(Node... children) {
        getChildren().addAll(children);
    }

/**
 * Constructs a group consisting of the given children.
 *
 * @param children children of the group
 * @throws NullPointerException if the specified collection is null
 * @since JavaFX 8.0
 */
 public Group(Collection<Node> children) {
 getChildren().addAll(children);
 }

/**
     * Controls whether or not this {@code Group} will automatically resize any
     * managed resizable children to their preferred sizes
     * during the layout pass. If set to {@code false}, then the application is
     * responsible for setting the size of this Group's resizable children, otherwise
     * such nodes may end up with a zero width/height and will not be visible.
     * This variable has no effect on content nodes which are not resizable (Shape, Text, etc).
     *
     * @defaultValue true
     */
    private BooleanProperty autoSizeChildren;

public final void setAutoSizeChildren(boolean value){
        autoSizeChildrenProperty().set(value);
    }

public final boolean isAutoSizeChildren() {
        return autoSizeChildren == null ? true : autoSizeChildren.get();
    }

public final BooleanProperty autoSizeChildrenProperty() {
        if (autoSizeChildren == null) {
            autoSizeChildren = new BooleanPropertyBase(true) {

@Override
                protected void invalidated() {
                    requestLayout();
                }

@Override
                public Object getBean() {
                    return Group.this;
                }

@Override
                public String getName() {
                    return "autoSizeChildren";
                }
            };
        }
        return autoSizeChildren;
    }

/**
 * Gets the list of children of this {@code Group}.
 * @return the list of children of this {@code Group}.
 */
 @Override public ObservableList<Node> getChildren() {
 return super.getChildren();
 }

/**
     * @treatAsPrivate implementation detail
     * @deprecated This is an internal API that is not intended for use and will be removed in the next version
     */
    @Deprecated
    @Override
    protected Bounds impl_computeLayoutBounds() {
        layout(); // Needs to done prematurely, as we otherwise don't know the bounds of the children
        return super.impl_computeLayoutBounds();
    }

/**
 * Group defines the preferred width as simply being the width of its layout bounds, which
 * in turn is simply the sum of the positions & widths of all of its children. That is,
 * the preferred width is the one that it is at, because a Group cannot be resized.
 *
 * Note: as the layout bounds in autosize Group depend on the Group to be already laid-out,
 * this call will do the layout of the Group if necessary.
 *
 * @param height This parameter is ignored by Group
 * @return The layout bounds width
 */
 @Override
 public double prefWidth(double height) {
 if (isAutoSizeChildren()) {
 layout();
 }
 final double result = getLayoutBounds().getWidth();
 return Double.isNaN(result) || result < 0 ? 0 : result;
 }

/**
 * Group defines the preferred height as simply being the height of its layout bounds, which
 * in turn is simply the sum of the positions & heights of all of its children. That is,
 * the preferred height is the one that it is at, because a Group cannot be resized.
 *
 * Note: as the layout bounds in autosize Group depend on the Group to be already laid-out,
 * this call will do the layout of the Group if necessary.
 *
 * @param width This parameter is ignored by Group
 * @return The layout bounds height
 */
 @Override
 public double prefHeight(double width) {
 if (isAutoSizeChildren()) {
 layout();
 }
 final double result = getLayoutBounds().getHeight();
 return Double.isNaN(result) || result < 0 ? 0 : result;
 }

@Override
    public double minHeight(double width) {
        return prefHeight(width);
    }

@Override
    public double minWidth(double height) {
        return prefWidth(height);
    }

/**
     * Group implements layoutChildren such that each child is resized to its preferred
     * size, if the child is resizable. Non-resizable children are simply left alone.
     * If {@link #autoSizeChildren} is false, then Group does nothing in this method.
     */
    @Override protected void layoutChildren() {
        if (isAutoSizeChildren()) {
            super.layoutChildren();
        }
    }
}

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