[Ext 4.1 PR1] Checkbox focus/blur error

[sebbio]

Why not work blur/focus events on checkbox? And when i focused by JavaScript, blur event not correct running.
OS: Windows 7
Chrome Browser ver. 15.0.874.121 m - error confirm
FF 8 - work ok
Safari 5.1.1 - error confirm
IE9 - ok

Ext.onReady(function(){ 
        Ext.create('Ext.window.Window', { 
          modal: true, 
          title: 'Modal Window', 
          autoShow: true, 
          width: 200, 
          height: 120, 
          items: [{ 
            xtype: 'checkboxfield', 
            itemId: 'ch1', 
            boxLabel: 'why checkbox not focus', 
            listeners: { 
              focus: function(){ 
                console.info('NOW CLICK CHECKBOX!'); 
              }, 
              blur: function(){ 
                console.info('WHY BLUR?'); 
              } 
            } 
          },{ 
            xtype: 'textfield' 
          },{ 
            xtype: 'button', 
            text: 'Focus to checkbox', 
            handler: function(btn){ 
              btn.up('window').down('#ch1').focus(); 
            } 
          }] 
        }); 
      }); 

[mitchellsimoens]

There is an open bug already for this and the focus/blur events.