title: Ext JS 4.0.7 Load mask not working for Grid
body: <p>Load mask of a grid is not working which is triggered in button handler which is in the dockedItems of the same grid. (i am using Ext JS 4.0.7)</p>
  
  <p>But in console,</p>
  
  <pre><code>viewareaGrid = Ext.getCmp('mva')
  viewareaGrid.setLoading(true);
  </code></pre>
  
  <p>above code shows the load mask perfectly in console.</p>
  
  <p>Below code is the view in which i am manually filtering the users. </p>
  
  <p>filterFunction() will run for atleast 4 secs.</p>
  
  <p>What could be wrong ?</p>
  
  <pre><code>Ext.define('AM.view.main.user', {
      id:'mva',
      extend:'Ext.grid.Panel',
      region:'center',
      alias:'widget.mva',
      store:'user',
  
      dockedItems:[
  
                  {
                      id:'filter',
                      text:'Filter',
                      xtype:'button',
                      handler:function () {
                          var viewareaGrid = Ext.getCmp('mva')
                          viewareaGrid.setLoading(true);
                          filterFunction();
                          viewareaGrid.setLoading(false);
                      }
                  }]
  
  });
  </code></pre>