code: function () {
        if (!selection.isSelected()) {
          return;
        }
        var corners = grid.getCornerCoords([priv.selStart, selection.end()]);
        var r, c, changes = [];
        for (r = corners.TL.row; r <= corners.BR.row; r++) {
          for (c = corners.TL.col; c <= corners.BR.col; c++) {
            if (self.getCellMeta(r, c).isWritable) {
              changes.push([r, datamap.colToProp(c), '']);
            }
          }
        }
        self.setDataAtCell(changes);
      }
docs: Deletes data from selected cells