I'm submitting a ... (check one with "x")

[ ] bug report => search github for a similar issue or PR before submitting
[x] feature request
[ ] support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior
There seems to be no way to focus a FormControl.

Expected behavior
FormControl provides a .focus() instance method, or access to the native HTML element.

What is the motivation / use case for changing the behavior?
To give input focus to a control when it is invalid, as in the following example:

if (!this.form.valid) {
  let invalid = <FormControl[]>Object.keys(this.form.controls).map(key => this.form.controls[key]).filter(ctl => ctl.invalid);
  if (invalid.length > 0) {
    // Give input focus to invalid[0]... how?
  }
  return false;
}

Please tell us about your environment:

• Angular version: 2.2.1

• Browser: N/A

• Language: TypeScript 2.0.3