import { ISurfaceContext } from '@devexpress/analytics-core/analytics-elements';
import * as ko from 'knockout';
import { XRControlSurface, XRControlViewModel } from './xrControl';
export declare class XRUnknownControlSurface extends XRControlSurface {
    constructor(control: XRControlViewModel, context: ISurfaceContext);
    isLoading: ko.Observable<boolean>;
    imageSrc: ko.Observable<string>;
    error: ko.Observable<string>;
    private getValue;
    private _getParentStyles;
    private _applyParentStyles;
}