/**
  * Merge rows into the form.
  *
  * @param Table $parent
  * @param Table $child
  */
 protected function mergeFields(Table $parent, Table $child)
 {
     foreach ($child->getRows() as $row) {
         $parent->addRow($row);
     }
 }
 /**
  * Add a row to the table.
  *
  * @param  RowInterface $row
  * @return $this
  */
 public function addTableRow(RowInterface $row)
 {
     $this->table->addRow($row);
     return $this;
 }