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            boxes = calcs.boxes,
            meta  = calcs.meta;
        
        //invoke the overflow handler, if one is configured
        if (tSize.width > 0) {
            var handler = this.overflowHandler,
                method  = meta.tooNarrow ? 'handleOverflow' : 'clearOverflow';
            
            var results = handler[method](calcs, tSize);
            
            if (results) {
                if (results.targetSize) {
                    tSize = results.targetSize;
                }
                
                if (results.recalculate) {
                    items = this.getVisibleItems(container);
                    calcs = this.calculateChildBoxes(items, tSize);
                    boxes = calcs.boxes;
                }
            }
        }
        
<span id='Ext-layout-BoxLayout-property-layoutTargetLastSize'>        /**
</span>         * @private
         * @property layoutTargetLastSize
         * @type Object
         * Private cache of the last measured size of the layout target. This should never be used except by
         * BoxLayout subclasses during their onLayout run.
         */
        this.layoutTargetLastSize = tSize;
        
<span id='Ext-layout-BoxLayout-property-childBoxCache'>        /**
</span>         * @private
         * @property childBoxCache
         * @type Array
         * Array of the last calculated height, width, top and left positions of each visible rendered component
         * within the Box layout.
         */
        this.childBoxCache = calcs;
        
        this.updateInnerCtSize(tSize, calcs);
        this.updateChildBoxes(boxes);

        // Putting a box layout into an overflowed container is NOT correct and will make a second layout pass necessary.
        this.handleTargetOverflow(tSize, container, target);
    },

<span id='Ext-layout-BoxLayout-method-updateChildBoxes'>    /**
</span>     * Resizes and repositions each child component
     * @param {Array} boxes The box measurements
     */
    updateChildBoxes: function(boxes) {
        for (var i = 0, length = boxes.length; i &lt; length; i++) {
            var box  = boxes[i],
                comp = box.component;
            
            if (box.dirtySize) {
                comp.setSize(box.width, box.height);
            }
            // Don't set positions to NaN
            if (isNaN(box.left) || isNaN(box.top)) {
                continue;
            }
            
            comp.setPosition(box.left, box.top);
        }
    },

<span id='Ext-layout-BoxLayout-method-updateInnerCtSize'>    /**
</span>     * @private
     * Called by onRender just before the child components are sized and positioned. This resizes the innerCt
     * to make sure all child items fit within it. We call this before sizing the children because if our child
     * items are larger than the previous innerCt size the browser will insert scrollbars and then remove them
     * again immediately afterwards, giving a performance hit.
     * Subclasses should provide an implementation.
     * @param {Object} currentSize The current height and width of the innerCt
     * @param {Array} calculations The new box calculations of all items to be laid out
     */
    updateInnerCtSize: function(tSize, calcs) {
        var align   = this.align,
            padding = this.padding,
            width   = tSize.width,
            height  = tSize.height;
        
        if (this.type == 'hbox') {
            var innerCtWidth  = width,
                innerCtHeight = calcs.meta.maxHeight + padding.top + padding.bottom;

            if (align == 'stretch') {
                innerCtHeight = height;
            } else if (align == 'middle') {
                innerCtHeight = Math.max(height, innerCtHeight);
            }
        } else {
            var innerCtHeight = height,
                innerCtWidth  = calcs.meta.maxWidth + padding.left + padding.right;

            if (align == 'stretch') {
                innerCtWidth = width;
            } else if (align == 'center') {
                innerCtWidth = Math.max(width, innerCtWidth);
            }
        }

        this.innerCt.setSize(innerCtWidth || undefined, innerCtHeight || undefined);
    },

<span id='Ext-layout-BoxLayout-method-handleTargetOverflow'>    /**
</span>     * @private
     * This should be called after onLayout of any BoxLayout subclass. If the target's overflow is not set to 'hidden',
     * we need to lay out a second time because the scrollbars may have modified the height and width of the layout
     * target. Having a Box layout inside such a target is therefore not recommended.
     * @param {Object} previousTargetSize The size and height of the layout target before we just laid out
     * @param {Ext.Container} container The container
     * @param {Ext.Element} target The target element
     */
    handleTargetOverflow: function(previousTargetSize, container, target) {
        var overflow = target.getStyle('overflow');

        if (overflow &amp;&amp; overflow != 'hidden' &amp;&amp;!this.adjustmentPass) {
            var newTargetSize = this.getLayoutTargetSize();