declare namespace Ext {
    export namespace dom {
        export interface UnderlayConfig {
            target?: Ext.dom.Element;
            zIndex?: number;
        }

        export class Underlay extends Ext.Base  {
            public beforeShow(): void;
            public getInsertionTarget(): Ext.dom.Element;
            public getPool(): Ext.dom.UnderlayPool;
            public hide(): void;
            public realign(x?: number, y?: number, width?: number, height?: number): void;
            public setZIndex(zIndex?: number): void;
            public show(): void;
        }
    }
}