Dropdown does not Submit any value

[Nico]

Hi,
i have a problem with the dropdown-box. It does not submit any value.
My Form looks like this:

<form action="/setseeker/users/add/" id="UserAddForm" method="post" accept-charset="utf-8">

	<input type="hidden" name="_method" value="POST"/>

<span class="label">Mail</span>

	<div class="input text required">
		<input name="data[User][email]" maxlength="255" type="text" value="" id="UserEmail"/>
	</div>

SOME OTHER FORM ELEMENTS

	<span class="label">Pro Nutzer</span>
	<div class="input select">
		<select name="data[User][ispro]" id="UserIspro">
		<option value="0">Nein</option>
		<option value="1">Ja</option>
		</select>
	</div>

	<div class="submit">
		<input  type="submit" value="Erstellen"/>
	</div>
</form>

The Post looks like:
	

Array
(
    [_method] => POST
    [data] => Array
        (
            [User] => Array
                (
                    [username] => 
                    [password] => 
                    [email] => [e-mail]
                    [newpassword] => 1
                )

        )



As you can see, there is no value for 

<select name="data[User][ispro]" id="UserIspro">

I dont know whats wrong. I hope someone of you may help me to fix this error.

Thanks
Nico