protected function getStyles()
    {
        $_sParentStyles = parent::getStyles();
        return $_sParentStyles . <<<CSSRULES
/* Posttype Field Type */
.admin-page-framework-field input[type='checkbox'] {
    margin-right: 0.5em;
}     
.admin-page-framework-field-posttype .admin-page-framework-input-label-container {
    padding-right: 1em;
}    
CSSRULES;
    }