How to use the cwl-svg.SelectionPlugin function in cwl-svg

ngAfterViewInit() {


        this.graph = new WorkflowGraph({
            svgRoot: this.canvas.nativeElement,
            model: this.model as any,
            plugins: [
                new SVGEdgeHoverPlugin(),
                new SelectionPlugin(),
                new ZoomPlugin(),
                new SVGNodeMovePlugin(),
                new SVGJobFileDropPlugin(),
                new SVGArrangePlugin(),
                new SVGRequiredInputMarkup(),
                new SVGExecutionProgressPlugin(),
            ]
        });

        this.graph.fitToViewport();
        this.draw.emit(this);

        this.jobControl.valueChanges.pipe(
            map(v => this.normalizeJob(v))
            // comment for now because JSON.stringify returns null for NaN and Infinity (then not working for numbers)
            // distinctUntilChanged((a, b) => JSON.stringify(a) === JSON.stringify(b))

drawGraphAndAttachListeners() {

        this.graph = new Workflow({
            svgRoot: this.canvas.nativeElement as SVGSVGElement,
            model: this.model as any,
            plugins: [
                new SVGArrangePlugin(),
                new SVGPortDragPlugin(),
                new SVGNodeMovePlugin(),
                new SVGEdgeHoverPlugin(),
                new SVGValidatePlugin(),
                new SelectionPlugin(),
                new ZoomPlugin(),
                new DeletionPlugin(),
                new UpdatePlugin()
            ],
            editingEnabled: !this.readonly
        });

        try {
            this.graph.fitToViewport();
        } catch (ex) {
            setTimeout(() => {
                console.warn("Workflow should be able to fit in by now...");
                try {
                    this.graph.fitToViewport();
                    this.draw.emit(this);
                    this.functionsWaitingForRender.forEach(fn => fn());