title: "Export to excel" button kendogrid download more than 1 file
body: <p>I have a function that creates a kendo grid which has the button to download it as a ".xlsx" file.
  There is a dropdown that when is changed, calls this function again.</p>
  
  <pre><code>function CreateGrid(result) {
  
      var chartSeries = result.ChartData;
      var gName = $("#dropdown1 option:selected").text();
      // Create Grid
      $("#grid1").kendoGrid({
          toolbar: ["excel"],
          excel: {
              fileName: "Grid1_"+gName+".xlsx",
              filterable: true,
              allPages: true
          },
          columns: [
              { field: "column1", width: "90px", title: "&lt;strong&gt;Item1&lt;/strong&gt;" },
              { field: "column2", width: "80px", title: "&lt;strong&gt;Item2&lt;/strong&gt;" },
              { field: "column3", width: "120px", title: "&lt;strong&gt;Item3&lt;/strong&gt;", format: "{0:c2}" }
  
          ],
          groupable: false,
          resizable: true,
          pageable: false,
          scrollable: true,
          filterable: false,
          sortable: true,
          pageSize: 50
      });
  
      // Set Grid data source
      $("#grid1").data("kendoGrid").setDataSource(
          new kendo.data.DataSource({
              //Set the data of the grid as the result array of object.
              data: result.ChartData
          })
      );
  }
  </code></pre>
  
  <p>The problem is, when i click in the button to download the file, it downloads every grid previously made when I want only the current one.
  For example, i created the grid once, then i changed the dropdown and the grid changed to the values corresponding to the new dropdown value, but when I click in the button, it downloads 2 files, from the first grid made and the one showing.
  If I change the dropdown again, then the values will change according to the dropdown value but if I click to download the file,it downloads the previous 2 files + the one in the grid.</p>
  
  <p>It seems that even thought i cant see the previous grids anymore, they are still there so I want to know how can I destroy/erase/clean them.</p>