How to emit event when using snack-bar (entryComponents) in angular2

Here I had a method 'confirmSth', loaded a component 'SnackCheckBoxComponent' dynamically.

I would like to know If I can get some msg in my OrderDetailComponent to distinguish which button from SnackCheckBoxComponent i clicked so to decide the confirmSth return true or false.

//...
import { MdSnackBar, MdSnackBarRef } from '@angular/material';

export class OrderDetailComponent {

  constructor(public snackBar: MdSnackBar) {

  confirmSth(): boolean {

    // ...condition
    if (condition) return true

    this.snackBarRef = this.snackBar.openFromComponent(SnackCheckBoxComponent, { duration: 50000 })
    this.snackBarRef.instance.snackBarRefCheckComponent = this.snackBarRef

    // I would like to know If I can get some msg here to distinguish which button i clicked so to decide return true or false.

  }

}

@Component({
  selector: 'snack-check-box',
  templateUrl: './snack-check-box.html',
  styleUrls: ['./snack-check-box.css'],
})
export class SnackCheckBoxComponent {
  public snackBarRefCheckComponent: MdSnackBarRef<SnackCheckBoxComponent>

  private onCancel() {
    alert('clicked option 1');
    this.snackBarRefCheckComponent.dismiss();
  }

  private onSubmit() {
    alert('clicked option 2');
    this.snackBarRefCheckComponent.dismiss();
  }
}

here is my './snack-check-box.html'

<span>overloaded, whether to continue xxx</span>

<a (click)="onSubmit()">yes</a>
<a (click)="onCancel()">no</a>