issues with FormHelper

hi,

Controller:

class ConfigurationsController extends AppController {
   
    public $components = array(
        'Security'
    );
    public function index(){
       
        /*..................*/
       
    }
}

View:

<?php
    echo $this->Form->create('Configurations');
    echo $this->Form->input('Trader.name');

   

    /****

    Settings:

    table: traders

    column: has_ftp tinyint(1)

    View Result:

    <div class="input checkbox">

          <input type="hidden" value="0" id="TraderHasFtp_" name="data[Trader][has_ftp]">

          <input type="checkbox" id="TraderHasFtp" value="1" name="data[Trader][has_ftp]">

          <label for="TraderHasFtp">Has Ftp</label>

    </div>

    Question:

    Why create the FormHelper an additional hidden input field?!?!?!

    ****/
    echo $this->Form->input('Trader.has_ftp');
    echo $this->Form->input('Ftp.ftp_server');
    echo $this->Form->input('Ftp.ftp_login_name');
    echo $this->Form->input('Ftp.ftp_password');
    echo $this->Form->input('Ftp.root_directory');

   

    /****

    Settings:

    table: ftps

    column: vendor tinyint(1)

    View Result:

    <div class="input text">
         <label for="FtpVendor">Vendor</label>
         <input type="text" id="FtpVendor" name="data[Ftp][vendor]">
   </div>

    Question:

    The FormHelper creates an input field instead of a checkbox!?!?!

    ***/

    echo $this->Form->input('Ftp.vendor');
    echo $this->Form->end('Absenden');

//What i´m doing wrong?