Yii Login Message

When we login in yii, we will get the error message only for "username" and "password". Now I added to code here to set and get more error message in yii login form.

UserIdentity.php


<?php
/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
    private $_id;
    const ERROR_ACCOUNT_INACTIVE=1;    
    const ERROR_ACCOUNT_VERIFY=2;
    
     public function authenticate()
  {  
    $users=User::model()->find(array('condition'=>'username="'.$this->username.'" and password="'.sha1($this->password).'"'));       
   if($users==null){
        $this->errorCode=self::ERROR_USERNAME_INVALID;
       }else{
        if($users->isactive=='' || $users->isactive==null){
            $this->errorCode=self::ERROR_ACCOUNT_INACTIVE;                            
        }else if($users->verfiy==0 && $users->verfiy==null){
            $this->errorCode=self::ERROR_ACCOUNT_VERIFY;                        
        }else{
            $this->_id=$users->userid;
            $this->setState("username",$users->username);
            $this->setState("accesslevel",'user');
            $this->errorCode=self::ERROR_NONE;            
        }
        }      
  return !$this->errorCode;
 }
      public function getId()
        {
                return $this->_id;
        }
}
?>

LoginForm .php

'Remember me next time',
  );
 }

 /**
  * Authenticates the password.
  * This is the 'authenticate' validator as declared in rules().
  */
 public function authenticate($attribute,$params)
 {
    
  if(!$this->hasErrors())
  {
    
   $this->_identity=new UserIdentity($this->username,$this->password);
   if(!$this->_identity->authenticate()){
    switch($this->_identity->errorCode){
        case(UserIdentity::ERROR_USERNAME_INVALID):
         $this->addError('password','Incorrect username or password.');
                    break;
                 case(UserIdentity::ERROR_ACCOUNT_VERIFY):
                    $this->addError('password',"Please verify your account");
                    break;                    
                case(UserIdentity::ERROR_ACCOUNT_INACTIVE):
                    $this->addError('password','Looks like your account is still to be activated');
                    break;
    }                  
   }   
  }
 }

 /**
  * Logs in the user using the given username and password in the model.
  * @return boolean whether login is successful
  */
 public function login()
 {
  if($this->_identity===null)
  {
   $this->_identity=new UserIdentity($this->username,$this->password);
   $this->_identity->authenticate();
  }
  if($this->_identity->errorCode===UserIdentity::ERROR_NONE)
  {
   $duration=$this->rememberMe ? 3600*24*30 : 0; // 30 days
   Yii::app()->user->login($this->_identity,$duration);
   return true;
  }
  else
   return false;
 }
}