如何为引导模式中的ng-select添加自动聚焦

import { Component, ViewChild, ElementRef } from '@angular/core';
import { NgSelectComponent } from '@ng-select/ng-select';

@Component({
  selector: 'app-your-component',
  template: `
    <ng-select #selectBox></ng-select>
  `
})
export class YourComponent {
  @ViewChild('selectBox') selectBox: NgSelectComponent;
  @ViewChild('selectBox', { read: ElementRef }) selectBoxElement: ElementRef;
}

ngAfterViewInit() {
  this.selectBoxElement.nativeElement.focus();
}