@Injectable()
export class ComponentInjector {

    constructor(
        private _injector: Injector,
        private _applicationRef: ApplicationRef,
        private _componentFactoryResolver: ComponentFactoryResolver) {
    }

    injectComponent({componentClass, parentElement = null}) {

        if (parentElement == null) {
            parentElement = this._applicationRef.components[0].hostView['rootNodes'][0];
        }

        const factory = this._componentFactoryResolver.resolveComponentFactory(componentClass);
        const component = factory.create(this._injector);

        // if you wanna create the component as a child of ur component.
        // component = this.viewContainerRef.createComponent(factory);

        this._applicationRef.attachView(component.hostView);

        parentElement.appendChild(component.hostView['rootNodes'][0]);

        return component;

    }

}

@Component({
    selector: 'wt-free',
    template: `
        <div>HELLO {{ name }}</div>
    `
})
export class DialogComponent {
    @Input() name = 'Foo';

    ngOnChanges(changes) {
        console.log(changes);
    }
}

@Component({
    selector: 'wt-brain',
    template: `
        <div>BRAIN</div>
        <button (click)="show()">SHOW</button>
        <button (click)="hide()">HIDE</button>
    `
})
export class BrainComponent {
    private dialog: ComponentRef<DialogComponent>;

    constructor(private _componentInjector: ComponentInjector) {
    }

    show() {
        this.dialog = this._componentInjector.injectComponent({componentClass: DialogComponent}) as ComponentRef<DialogComponent>;
        setInterval(() => this.dialog.instance.name += 'X', 300);
    }

    hide() {
        this.dialog.destroy();
    }

}

// <ng-container *ngComponentOutlet="cmp"></ng-container>