title: First tab panel does not show data in grid (IE 9)
body: <p>I have a tab panel and every tab has grid in it, but after loading, data in first tab is missing but it displays fine in 2nd tab , this is working in all the browsers in Extjs 4.2 but it is not working in Extjs 5.0 with IE. ( working fine in chrome ) thee is no errors on console. I am getting crazy with this issue. may be it is a bug in Extjs 5. Thanks in advance.</p>
  
  <pre><code>//main panel class
  
  Ext.define('MyApp.view.MyView', {
    extend: 'Ext.tab.Panel',
    alias : 'widget.myView',
    id : 'myView',
    autoScroll : true,
    activeTab: 0,
    height: 600,
  
    layout: {
      type: 'column'
    },
  
    requires : [ 
      'MyView.view.FirstTab',
      'MyView.view.SecondTab'    
    ],
  
    initComponent : function() {
  
      this.items = [
        {  
         xtype: 'panel', 
         id: 'fTab',
         autoScroll: true, 
         items: [ { xtype: 'firstTab' }] 
        },
        {  
          xtype: 'panel', 
          id: 'sTab',
          autoScroll: true,
          items: [ { xtype: 'secondTab' } ] 
        }
    ];
  
      this.callParent(arguments);
    }
  });
  
       //controller 
  
           var isActivieTabSet = false;
  
           // if store1 has data show the first tab
           if(store1Count &gt; 0) {
              var tab0 = myView.down('#fTab');
              tab0.tab.show();
              if (!isActivieTabSet) {
                searchSummaryView.setActiveTab(tab0);
                isActivieTabSet = true;
              }          
  
            } else {
              myView.down('#fTab').tab.hide();
            }
  
            //check if store2 has data
            if(store2Count &gt; 0) {
              var tab1 = myView.down('#sTab');
              tab1.tab.show();
              if (!isActivieTabSet) {
                myView.setActiveTab(tab1);
                isActivieTabSet = true;
              }
            } else {
              myView.down('#sTab').tab.hide();
            }
  </code></pre>