title: Can i define constructor and private variables in Observer?
body: <p>I have two methods in my observer defined in <code>config.xml</code>.</p>
  
  <p>If i want to add other methods in the observer.php that they will not catch any event:</p>
  
  <p>Should i define them to <code>config.xml</code>?
  And If i put some variables like <code>private $myvar</code> will I be able to use them?</p>
  
  <p>Can I use a constructor?</p>