$form->field(name => "sid", type => "hidden", value => $session->id,
force => 1);
$form->field(name => "do", type => "hidden", value => "revert",
$form->field(name => "sid", type => "hidden", value => $session->id,
force => 1);
$form->field(name => "do", type => "hidden", value => "revert",