public function getColumnsStartingWith($namePrefix)
{
$columnValues = array();
foreach ($this->getRows() as $row) {
$columns = $row->getColumns();
foreach ($columns as $column => $value) {
if (strpos($column, $namePrefix) === 0) {
$columnValues[] = $row->getColumn($column);
}
}
}
return $columnValues;
}