<?php
$fields
  ->text("FirstName")
  ->numeric("Age");

<?php
$fields->addFieldToTab("Root.Main", TextField::create("FirstName", "First Name"),"Content");
$fields->addFieldToTab("Root.Main", TextField::create("Age", "Age"),"Content");

<?php
$fields
  ->tab("PersonalInfo")
    ->text("FirstName")
    ->numeric("Age")
  ->tab("Qualifications")
    ->grid("Qualifications","Qualifications", $this->Qualifications(), GridFieldConfig_RecordEditor::create());
    

<?php
$fields
  ->dropdown("PickOne")
    ->configure()
      ->setSource(array('1' => 'One', '2' => 'Two'))
      ->setEmptyString("-- None --")
    ->end()
  ->text("Title");

<?php
$fields->addFieldToTab("Root.Main", DropdownField::create("PickOne","Pick One")
  ->setSource(array('1' => 'One', '2' => 'Two'))
  ->setEmptyString("-- None --")
);
$fields->addFieldToTab("Root.Main", TextField::create("Title"));

<?php
$fields
  ->text("Name")
  ->group()
    ->text("Address")
    ->text("City")
    ->text("PostalCode")
  ->end();

<?php
$fields->addFieldToTab("Root.Main", TextField::create("Name"));
$fields->addFieldToTab("Root.Main", FieldGroup::create(
  TextField::create("Address"),
  TextField::create("City")
  TextField::create("PostalCode")
));

<?php
$fields
  ->imageUpload("MyImage")
  ->hasManyGrid("RelatedObjects","Related objects", $this->RelatedObjects())
    ->configure()->addDragAndDrop("Sort")->end();