title: Dojo ItemFileWriteStore issue with IE7
body: <p>I have a grid that is embedded within a ContentPane which is in a tabContainer. When loading the itemfilewritestore IE7 pops an error.</p>
  
  <p>Code:</p>
  
  <p>var theData = {identifies : id , items[]};
  var theStore = new dojo.data.ItemFileWriteStore({data: theData});</p>
  
  <p>console.debug(theStore); // this throws some weird error</p>
  
  <p>error:
  {close:function(_81)if(!this.isDirty)........There are unsaved changes present in the store Please save or revert the changes before invoking close.</p>
  
  <p>This error only shows itself in IE7. FF has no problem and renders the data properly. And yes I know there is no data in this code but in the real code the data is added later.</p>