angular viewchild under *ngIf , always get undefined

gistfile1.txt

```typescript

<pre>{{test.value}}</pre>

<button (click)="isVisible = true">Show it</button>
<input #test *ngIf="isVisible">
Then in your component you "grab" the test element like this:

private test: ViewContainerRef;
@ViewChild('test') set someDummySetterName(theElementRef: ViewContainerRef) {
    this.test = theElementRef;
}
````