Angular2 FormBuilder: Using 'this' in a custom validator

I'm developing a form using Angular2's FormBuilder with custom validation. Problem: In customValidator I'm using `this` to access the local object `data`. I'm getting a `undefined` error when the validation is executed. It looks like the customValidator is executed in a different object and therefore changing the `this` reference Question: How can I pass a reference of `this` to the customValidator? ``` export class Ast { public data:any; public myForm:FormGroup; constructor(private _fb:FormBuilder) { this.data = {foo: "bar"}; } customValidator(c: FormControl) { if (this.data.foo == "bar") { // This line crashes // DO something } } ngOnInit() { this.myForm = this._fb.group({ some_field: ['', [<any>Validators.required], this.customValidator] }) } } ```