title: call parent class function on extjs 3
body: <p>i have extjs class like this for Add:</p>
  
  <pre><code>    Ext.ns('Example');
  
  Example.Form = Ext.extend(Ext.form.FormPanel, {
  
     ,initComponent:function() {
          // hard coded - cannot be changed from outsid
          var config = {
              items: [{
              xtype: 'textfield',
              fieldLabel: 'title',
              name: 'author',
              allowBlank: false
            }
  
           .........................
  
      ]
              ,buttons:[
                  {
                      text:'submit'
                      ,formBind:true
                      ,scope:this
                      ,handler:this.submit
              }]
          }; // eo config object
  
          // apply config
          Ext.apply(this, Ext.apply(this.initialConfig, config));
  
          // call parent
          Example.Form.superclass.initComponent.apply(this, arguments);
      } // eo function initComponent
      /**
      * Form onRender override
      */
      ,onRender:function() {
          ..................
      } // eo function onRender
      /**
      * Reset
      */
     ,reset:function() {
          this.getForm().reset();
      } // eo function onRender
      /**
      * Load button click handler
      */
      ,onLoadClick:function() {
         ....................
      } 
  
      ,submit:function() {
          ........................
      } 
  
      ,onSuccess:function(form, action) {
         ..........................
      } 
  
  
      ,onFailure:function(form, action) {
             ......................          
      } // eo function onFailure
  
      ,showError:function(msg, title) {
           ........................
          });
      } 
  }); 
  </code></pre>
  
  <p>and i have another extend for Edit:</p>
  
  <pre><code>Example.Form2 = Ext.extend(Example.Form, {
  
      ......
   });
  </code></pre>
  
  <p>how i can call "onLoadClick" function from first class in secound class?because i want to load data to my form before form load.</p>