    /**
     * A layout that arranges items vertically down a Container. This layout optionally divides available vertical space
     * between child items containing a numeric `flex` configuration.
     *
     * This layout may also be used to set the widths of child items by configuring it with the {@link #align} option.
     *
     *     @example
     *     Ext.create('Ext.Panel', {
     *         width: 500,
     *         height: 400,
     *         title: "VBoxLayout Panel",
     *         layout: {
     *             type: 'vbox',
     *             align: 'center'
     *         },
     *         renderTo: document.body,
     *         items: [{
     *             xtype: 'panel',
     *             title: 'Inner Panel One',
     *             width: 250,
     *             flex: 2
     *         },
     *         {
     *             xtype: 'panel',
     *             title: 'Inner Panel Two',
     *             width: 250,
     *             flex: 4
     *         },
     *         {
     *             xtype: 'panel',
     *             title: 'Inner Panel Three',
     *             width: '50%',
     *             flex: 4
     *         }]
     *     });
     */
    Ext.define('Ext.layout.container.VBox', {

        /* Begin Definitions */

        alias: ['layout.vbox'],
        extend: 'Ext.layout.container.Box',
        alternateClassName: 'Ext.layout.VBoxLayout',

        /* End Definitions */

        /**
         * @cfg {String} align
         * Controls how the child items of the container are aligned. Acceptable configuration values for this property are:
         *
         * - **left** : **Default** child items are aligned horizontally at the **left** side of the container
         * - **center** : child items are aligned horizontally at the **mid-width** of the container
         * - **stretch** : child items are stretched horizontally to fill the width of the container
         * - **stretchmax** : child items are stretched horizontally to the size of the largest item.
         */
        align : 'left', // left, center, stretch, strechmax

        //@private
        alignCenteringString: 'center',

        type: 'vbox',

        direction: 'vertical',

        // When creating an argument list to setSize, use this order
        parallelSizeIndex: 1,
        perpendicularSizeIndex: 0,

        parallelPrefix: 'height',
        parallelPrefixCap: 'Height',
        parallelLT: 't',
        parallelRB: 'b',
        parallelBefore: 'top',
        parallelBeforeCap: 'Top',
        parallelAfter: 'bottom',
        parallelPosition: 'y',

        perpendicularPrefix: 'width',
        perpendicularPrefixCap: 'Width',
        perpendicularLT: 'l',
        perpendicularRB: 'r',
        perpendicularLeftTop: 'left',
        perpendicularRightBottom: 'right',
        perpendicularPosition: 'x',
        configureItem: function(item) {
            if (item.flex) {
                item.layoutManagedHeight = 1;
            } else {
                item.layoutManagedHeight = 2;
            }

            if (this.align === 'stretch' || this.align === 'stretchmax') {
                item.layoutManagedWidth = 1;
            } else {
                item.layoutManagedWidth = 2;
            }
            this.callParent(arguments);
        }
    });