code: function(ev) {
          var text = this.clipboardModel.get('text');
  
          if (!supportWindowClipboardData) {
              (ev.originalEvent || ev).clipboardData.setData('text/plain', text);
          }
  
          ev.preventDefault();
      }
docs: oncopy event handler
  - Step 1: When the keys(ctrl+c) are downed on grid, 'key:clipboard' is triggered.
  - Step 2: To listen 'change:text event on the clipboard model.
  - Step 3: When 'change:text' event is fired,
  IE browsers set copied data to window.clipboardData in event handler and
  other browsers append copied data and focus to contenteditable element.
  - Step 4: Finally, when 'copy' event is fired on browsers except IE,
  setting copied data to ClipboardEvent.clipboardData.
  @param {jQueryEvent} ev - Event object
  @private