static/ext/src/layout/container/Card.js
function() {
        var wrap = arguments[0],
            items = this.getLayoutItems(),
            index = Ext.Array.indexOf(items, this.activeItem);
            
        return items[index + 1] || (wrap ? items[0] : false);
    }
function() {
        var wrap = arguments[0],
            items = this.getLayoutItems(),
            index = Ext.Array.indexOf(items, this.activeItem);
            
        return items[index + 1] || (wrap ? items[0] : false);
    }
Return the active (visible) component in the layout to the next card
@returns {Ext.Component} The next component or false.