var theGrid = new wijmo.grid.FlexGrid('#theGrid', {
    alternatingRowStep: 0,
    sortingColumn:function(s,e){
      var col = s.columns[e.col];
      if(col.currentSortIndex==-1){
        e.cancel=true;
        var cv = s.collectionView;
        cv.sortDescriptions.push(new wijmo.collections.SortDescription(col.binding,false));
      }
    },
    itemsSource: new wijmo.collections.CollectionView(getData())
  });