class DesignDetailsPage extends Page {

...

public function getCMSFields() {
$fields = parent::getCMSFields();

$fields->addFieldToTab("Root.Content.Main", new DropdownField(
'ResponsibleOffice',
'Responsible office',
singleton('DesignDetailsPage')->dbObject('ResponsibleOffice')->enumValues()
),'Content');

      $manager2 = new DataObjectManager(
         $this, // Controller
         'Characteristics', // Source name
         'Characteristic', // Source class
         array(
            'Label' => 'Label',
            'Value' => 'Value'
         ), // Headings
         'getCMSFields_forPopup' // Detail fields (function name or FieldSet object)
         // Filter clause
         // Sort clause
         // Join clause
      );

      $fields->addFieldToTab('Root.Content.Characteristics', $manager2);

$fields->addFieldToTab("Root.Content.Factsheet", new FileIFrameField('Download1','Factsheet'));
$fields->addFieldToTab("Root.Content.Design drawing", new FileIFrameField('Download2','Design drawing'));

      $manager3 = new DataObjectManager(
         $this, // Controller
         'References', // Source name
         'Reference', // Source class
         array(
            'Name' => 'Name',
            'Website' => 'Website',
            'Category' => 'Category'
         ), // Headings
         'getCMSFields_forPopup' // Detail fields (function name or FieldSet object)
         // Filter clause
         // Sort clause
         // Join clause
      );

      $fields->addFieldToTab('Root.Content.References', $manager3);

return $fields;
}   

class Page extends SiteTree {

...

public function getCMSFields() {
$fields = parent::getCMSFields();

if(!Member::currentUser()->isAdmin()) {

$fields->removeByName("Behaviour");
$fields->removeByName("To-do");
$fields->removeByName("Reports");
$fields->removeByName("Google Sitemap");
$fields->removeByName("Navigation label");
}

      $manager = new ImageDataObjectManager(
         $this, // Controller
         'Photos', // Source name
         'Photo', // Source class
         'Image',
         array(), // Headings
         'getCMSFields_forPopup' // Detail fields (function name or FieldSet object)
         // Filter clause
         // Sort clause
         // Join clause
      );

      $fields->addFieldToTab('Root.Content.Images', $manager);

$metadataTab = $fields->findOrMakeTab('Root.Content.Metadata');
$fields->removeByName('Metadata');
$fields->addFieldToTab('Root.Content', $metadataTab);

return $fields;
}   

class ImageAttachment extends DataObject {
static $db = array(
'Name' => 'Text'
);
static $has_one = array(
'Image' => 'Resize_Image',
'Product' => 'Product'
);

static $field_names = array('Name' => 'Name');

function getCMSFields_forPopup() {
$fields = new FieldSet();
$fields->push(new TextField('Name', 'Name'));
$fields->push(new ImageField('Image', 'Image'));

return $fields;
}

}

....
$imagetable = new ComplexTableField(
$this,
'ImageAttachments', // relation name
'ImageAttachment', // object class
ImageAttachment::$field_names, // fields to show in table
ImageAttachment::getCMSFields_forPopup(), // form that pops up for edit
"ProductID = {$this->ID}", // a filter to only display item associated with this page
"Name ASC" // Sort by name
);

$fields->addFieldToTab('Root.Content.Additional Images', $imagetable);