How to use the @hpcc-js/marshaller.ElementContainer function in @hpcc-js/marshaller

// tslint:disable
import { Table } from "@hpcc-js/dgrid";
import { FieldForm } from "@hpcc-js/form";
import * as marshaller from "@hpcc-js/marshaller";

//  Dashboard Element Container (Model)  ---
const ec = new marshaller.ElementContainer();

namespace data {
    export const Ins002_dsOutput1 = new marshaller.WU(ec)
        .url("http://10.173.147.1:8010/")
        .wuid("W20190617-131840")
        ;
    export const Ins002_dsOutput1_Ins002_dsOutput1_View_table1 = new marshaller.WUResult(ec)
        .wu(Ins002_dsOutput1)
        .resultName("Ins002_dsOutput1_View_table1")
        .responseFields([{ id: "state", type: "string" }, { id: "id", type: "number64" }, { id: "first_name", type: "string" }, { id: "last_name", type: "string" }, { id: "gender", type: "string" }, { id: "lat", type: "number" }, { id: "lng", type: "number" }, { id: "whole_number", type: "number64" }, { id: "decimal_number", type: "number" }, { id: "created_time", type: "string" }, { id: "created_date", type: "string" }, { id: "vip", type: "string" }])
        ;
    export const e_8 = new marshaller.Form()
        .formFields([
            new marshaller.FormField().fieldID("filter_state")
        ])
        ;

init(placeholder: string, urlStr, layoutJson?) {
        const _url = new Comms.ESPUrl().url(urlStr);
        if (!!_url.param("dashboard")) {
            this._dashy = new Dashboard(new ElementContainer())
                .target(placeholder)
                .hideSingleTabs(true)
                .titleVisible(false)
                .render()
                ;
        } else {
            this._dashy = new Dashy()
                .target(placeholder)
                .render()
                ;
        }

        this._dashy.element()
            .on("drop", () => this.dropHandler(this.event()))
            .on("dragover", () => this.dragOverHandler(this.event()))
            ;

export function loadDashboard(target: string) {
    const ec = new ElementContainer();
    const dashboard = new Dashboard(ec);
    dashboard
        .target(target)
        .titleVisible(false)
        .hideSingleTabs(true)
        .restore(sample as any)
        .render(w => {
            ec.refresh();
        })
        ;
}