code: function() {
          var scriptTag = document.createElement('script');
          scriptTag.type = 'text/vbscript';
          scriptTag.text = [
              'Function getIEByteArray(byteArray, out)',
                  'Dim len, i',
                  'len = LenB(byteArray)',
                  'For i = 1 to len',
                      'out.push(AscB(MidB(byteArray, i, 1)))',
                  'Next',
              'End Function'
          ].join('\n');
          Ext.getHead().dom.appendChild(scriptTag);
          this.self.vbScriptInjected = true;
      }
docs: Injects a vbscript tag containing a 'getIEByteArray' method for reading
  binary data from an xhr response in IE8 and below.
  @private