NbSelect prefix value

Hello,

I have a problem to prefix a value in my NbSelect.

Here is a part of my document.component.ts :
```
ngOnInit() {
this.documentForm = this.fb.group({
id: [this.factUpdate.id],
connectorId: [this.factUpdate.connectorId, Validators.required],
actualizationInterval: [this.factUpdate.actualizationInterval, [Validators.required, Validators.min(this.ActualizationIntervalMinValue)]],
});
}
```

and my document.component.html :
```

```
I use ngModel in my other NbSelect for prefix value but here, there is formControlName and it's not compatible with ngModel.

So, I tried to use reactive forms :
```this.documentForm.get('connectorId').setValue(1);```

But it didn't work.

How can i prefix NbSelect with value using formControlName ?

Thanks for your help,
Kévin