this adds a function markAllAsTouched to the FormGroup element. It either calls markAsTouched or markAllAsTouched on the controls of the current FormGroup. This will walk through all controls in the form tree recursively, marking all of them as touched.
this adds a function markAllAsTouched to the FormGroup element. It either calls markAsTouched or markAllAsTouched on the controls of the current FormGroup. This will walk through all controls in the form tree recursively, marking all of them as touched.
closes #14