title: extjs4 - How to call an application function from a controller?
body: <p>Given an application:</p>
  
  <pre><code>Ext.application({
      name: 'APP',
      appFolder: 'app',
  
      funcA: function() {
          console.log('called funcA');
      },
  
      launch: function() {
          ...
          var funcB = function() {
              console.log('called funcB');
          }
          ...
      }
  });
  </code></pre>
  
  <p>My controller can call this.application.funcA() but not funcB() within the launch method.  How can I call funcB() externally?</p>