declare namespace Ext {
    export namespace ux {
        export namespace layout {
            export interface ResponsiveColumnConfig {
                animatePolicy?: object;
                childEls?: object | string[] | object[];
                itemCls?: string;
                reserveScrollbar?: boolean;
                states?: object;
            }

            export class ResponsiveColumn extends Ext.layout.container.Auto  {
            }
        }
    }
}