Angular 2 form validation, minLength validator is not working

I have following Angular 2 form:

<register>
<form [ngFormModel] = "registrationForm">
<div class = "form-group">
<label class = "control-label" for="email">Email</label>
<input class = "form-control" type="email" id="email" ngControl="email" #email="ngForm">
</div>
<div *ngIf = "email.touched && email.errors">
<div *ngIf = "!email.errors.required && email.errors.underscoreNotFound" class = "alert alert-danger">
<span>Underscore is required</span>
</div>
<div *ngIf = "email.errors.required" class = "alert alert-danger">
<span>Email is required</span>
</div>
</div>
<div class = "form-group">
<label class = "control-label" for="password">Password</label>
<input class = "form-control" type="password" id="password" ngControl="password" #password="ngForm">
</div>
<div *ngIf = "password.touched && password.errors">
<div *ngIf = "password.errors.minLength && !password.errors.required" class = "alert alert-danger">
<span>Password should contain 6 characters</span>
</div>
<div *ngIf = "password.errors.required" class = "alert alert-danger">
<span>Password is required</span>
</div>
</div>
</form>
</register>


This is my Component where I have implemented validators:

import {Component} from '@angular/core';
import {Control, ControlGroup, FormBuilder, Validators} from '@angular/common';
import {CustomValidator} from './CustomValidator';

@Component({
selector: 'register',
templateUrl: './app/authentication/register_validation/register.html',
})

export class RegisterComponent{
registrationForm: ControlGroup;

constructor(formBuilder:FormBuilder)
{
this.registrationForm = formBuilder.group({
email: ['',Validators.compose([Validators.required, CustomValidator.underscore])],
password: ['',Validators.compose([Validators.required,Validators.minLength(6)])]
});
}

}


In this form, email field is working fine for both validators i.e. when I do not type anything , it gives "Email is required" message, when I start typing something, it gives "Underscore is required" message and when I type "_" all error messages disappears. However, when I try to apply such 2 validators on password field, it's not working. When I do not type password it gives message as "Password is required". But when I type something less than 6 characters, minLength message doesn't appear at all. What is wrong in this code?

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