TYPO3-6.2. Custom content type Extbase & # 8594; invalid value

I made an extbase Extension for custom content items. Since this is my first extension, I started with a simple "hello_world_ce". These are my files:

ext_tables.php

<?php
$TCA['tt_content']['types']['hello_world_ce']['showitem'] = '--palette--;LLL:EXT:hello_world/Resources/Private/Language/locallang_mod.xlf:content_element.hello_world.general;general, --palette--;LLL:EXT:hello_world/Resources/Private/Language/locallang_mod.xlf:content_element.hello_world.header;header';

      

        
        
        
      

    

ext_localconf.php

<?php
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPageTSConfig('<INCLUDE_TYPOSCRIPT: source="FILE:EXT:'.$_EXTKEY.'/Configuration/TypoScript/ModWizards.ts">');

      

        
        
        
      

    

ModWizards.ts

mod.wizards {
    newContentElement {
        wizardItems {
            hello_world {
                header = LLL:EXT:hello_world/Resources/Private/Language/locallang_mod.xlf:content_tab_header
                elements {
                    hello_world_ce {
                        icon = gfx/c_wiz/regular_header.gif
                        title = LLL:EXT:hello_world/Resources/Private/Language/locallang_mod.xlf:content_element.hello_world
                        description = LLL:EXT:hello_world/Resources/Private/Language/locallang_mod.xlf:content_element.hello_world.description
                        tt_content_defValues {
                            CType = hello_world_ce
                        }
                    }
                }
            }
            show = *
        }
    }
}

      

        
        
        
      

    

In the TYPO3 Backend I can see my content item and can add it to the page, but the dropdown for the content type says INVALID VALUE ("hello_world_ce")

What am I missing?

EDIT: I found the missing part. I needed to add my content type to CType array

ext_tables.php

$backupCTypeItems = $GLOBALS['TCA']['tt_content']['columns']['CType']['config']['items'];
$GLOBALS['TCA']['tt_content']['columns']['CType']['config']['items'] = array(
    array(
        'LLL:EXT:'.$_EXTKEY.'/Resources/Private/Language/locallang_mod.xlf:content_tab_header',
        '--div--'
    ),
    array(
        'LLL:EXT:'.$_EXTKEY.'/Resources/Private/Language/locallang_mod.xlf:content_element.hello_world',
        'hello_world_ce',
        'i/tt_content_header.gif'
    )
);
foreach($backupCTypeItems as $key => $value){
    $GLOBALS['TCA']['tt_content']['columns']['CType']['config']['items'][] = $value;
}