form in form not working

[eluser]Mitja[/eluser]
<?= form_open('happening/arrangements_scoop');?>

text...

<?= form_open('happening/arrangements_extra');?>

text...
<input type="submit" name="scoop" value="Scoop" />

<?= form_close();?>

text...
<input type="submit" name="extra" value="Extra" />

<?= form_close();?>

why inside form not working and i cannot use it, and the button Extra also not working. If i click on button Scoope the code of button Extra is executed.

How can i fix that?