如何以编程方式关闭 Ionic 3 中的 FAB 按钮列表？

How can I programmatically close a FAB button list in Ionic 3?

如何在 IONIC 3 中以编程方式关闭 FAB 按钮列表？

1) In HTML

<ion-fab top right #fab>
  <ion-fab-list side="bottom">
    <button ion-fab (click)="Close($event, fab)">
        <ion-icon  name="trash"></ion-icon> 
      </button>
  </ion-fab-list>
</ion-fab>

2) In .TS

import {  FabContainer } from 'ionic-angular';
.
.
.
Close(event, fab: FabContainer) {
    fab.close();
}