/**
* adds nested table
*
* @param string $alignment
* @return PHPRtfLite_Table_Nested
*/
public function addTable($alignment = PHPRtfLite_Table::ALIGN_LEFT)
{
$nestDepth = $this->_table->getNestDepth() + 1;
$table = new PHPRtfLite_Table_Nested($this, $alignment, $nestDepth);
$this->_elements[] = $table;
return $table;
}