code: function(startRow, endRow) {
          var me = this,
              store = me.store,
              i,
              tmp,
              record;
  
          if (me.isLocked()){
              return;
          }
  
          if (!Ext.isNumber(startRow)) {
              startRow = store.indexOf(startRow);
          }
          if (!Ext.isNumber(endRow)) {
              endRow = store.indexOf(endRow);
          }
  
          // swap values
          if (startRow > endRow){
              tmp = endRow;
              endRow = startRow;
              startRow = tmp;
          }
  
          for (i = startRow; i <= endRow; i++) {
              record = store.getAt(i);
              if (me.isSelected(record)) {
                  me.deselect(record);
              }
          }
      }
docs: Deselects a range of rows if the selection model {@link #isLocked is not locked}.
  @param {Ext.data.Model/Number} startRow The record or index of the first row in the range
  @param {Ext.data.Model/Number} endRow The record or index of the last row in the range