...
      editor: FilteringSelect,
      editorArgs: {
        props: 'required: false, searchAttr: "account"',
        toEditor: function(storeData, gridData, cell, editor) {
          var grid = cell.grid;
          var item = cell.row.item();
          editor.set("store", grid.benutzerStore);
          return item.abzeichner;
        },
        fromEditor: function(value, cell) {
          return cell.widget().gridCellEditField.get('item').id;
        }
      },
      customApplyEdit: function(cell, value) {
        return cell.row.setRawData({
          abzeichner: value
        });
      },
...