title: Extjs merge objects
body: <p>I have a super class in my application, that defines an object like this:</p>
  
  <pre><code>Ext.define('superclass', {
      myObject: {
          prop1: true,
          prop2: 200,
          ..
      }
  </code></pre>
  
  <p>and a child class that inherited the superclass above, that declares the same object:</p>
  
  <pre><code>Ext.define('childclass', {
      extend: 'superclass',
  
      myObject: {
          prop3: false,
          prop4: false,
          ..
      }
  </code></pre>
  
  <p>The problem is with that, the myObject in the child class has only the prop3 and prop4 properties.</p>
  
  <p>I need that myObject ib child class has all prop1, prop2, prop3 and prop4 properties.</p>
  
  <p>How can I do this ?</p>