title: typescript jquery focusin unbind event doesnt work
body: <p>I have a focusin binding inside a class. I've tried the jQuery <code>unbind</code> method. Seems not to work. </p>
  
  <p>This is just an example :</p>
  
  <pre><code>&lt;html&gt;
      &lt;body&gt;
          &lt;input type="text"/&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  
  module TheClass {
      export class MyClass {
          private static focusHandler = () =&gt; { console.log("hello from log"); };
  
          public static bindInput() {
              $("input").bind("focusin", MyClass.focusHandler);
          }
  
          public static unbindInput() {
              $("input").unbind("focusin", MyClass.focusHandler);
          }
      }
  }
  </code></pre>