[passing mysqli object to an attribute of another class HELP!]

thanks for the great insights dude.. I'll go ahead and sort this one out hopefully

[passing mysqli object to an attribute of another class HELP!]

I don't know why it won't work.. as the topic titles says that I am trying to pass a mysqli object to a property in another class  but it keeps me getting an error.

here's the code for the mysqli object that i want to pass to another class

class ConnectMe2Db
{
	public $dbname  = 'somedatabase';
	public $dbuname = 'root';
	public $dbpass  = '';
	public $dbhost  = 'localhost';
	
	function __construct()
	{
		$mysqli = new mysqli($this->dbhost,$this->dbuname,$this->dbpass,$this->dbname)
			or die ('ERROR: '.$mysqli->connect_errno);
		return $mysqli;
	}
       # OTHER CODES...
}

and here is the class that i want the Mysqli object to pass to:

class DatabaseUsers
{
	private $dbconnection;
	
        function __construct()
	{
		$this->dbconnection = new ConnectMe2Db();#mysqli object will be passed to this attribute '$dbconnection'
	}
	
	public function session($username, $password)
	{
		$UserName = mysqli_real_escape_string($this->dbconnection,$username);
		$Password = mysqli_real_escape_string($this->dbconnection,md5($password));
		$querry = "SELECT * FROM trakingsystem.login WHERE username='$username' and password='$password'";
		$result = mysqli_query($this->dbconnection,$querry) or die (mysqli_error($this->dbconnection));
		$count = mysqli_num_rows($result);
		$row = mysqli_fetch_array($result);
		if ($count > 0)
			{
                              #some code here
			}
	}
#some other code here
}

and this outputs 4  errors:

#outputs 2 of these:

Warning: mysqli_real_escape_string() expects parameter 1 to be mysqli

and some

mysqli_query() expects parameter 1 to be mysqli

mysqli_error() expects parameter 1 to be mysqli

is there something wrong with the logic that I've made? please help thanks