<?php
//file mysite/code/CoursePage.php
class CoursePage extends Page {
   static $db = array();
   static $has_one = array();

   static $has_many = array(
      'Courses' => 'Course'   
   );
   
   //list the location and fee entries in a table
   function getCMSFields() {
      $fields = parent::getCMSFields();
      $tablefield = new ComplexTableField(
         $this,
         'Courses',
         'Course',
         array(
            'Location' => 'Location',
            'Fee' => 'Fee'
         ),
         'getCMSFields_forPopup'
      );

      $tablefield->setAddTitle( 'A Course' );
      $fields->addFieldToTab( 'Root.Content.Courses', $tablefield );
      return $fields;

   }

}

class CoursePage_Controller extends Page_Controller {
}
?>

<?php
class Course extends DataObject {

   public static $db = array(
      'Location' => 'Text',
      'Fee' => 'Currency'
   );

   public static $has_one = array(
      'CoursePage' => 'CoursePage'
   );

   public static $has_many = array(
      'CourseDates' => 'CourseDate'
   );

   //when an entry in the 'Courses' tab is clicked, I want to show a table of dates
   function getCMSFields_forPopup() {
      $fields = new FieldSet();
      $fields->push( new TextField( 'Location' ) );
      $fields->push( new CurrencyField( 'Fee' ) );

      $ctf = new TableField(
         'CourseDates',
         'CourseDate',
         array( 'Date' => 'Date' ),
         array( 'Date' => 'DateField' )
         //array( 'Date' => 'CalendarDateField' ) //the bottom of this gets cut off obscuring the dates!
      );

      $fields->push( $ctf );
      return $fields;
   }
} //end class

<?php
class CourseDate extends DataObject {

   //it's just a 'Date' named 'Date'
   public static $db = array(
      'Date' => 'Date'
   );

   //make the link back to the 'parent'
   public static $has_one = array(
      'Course' => 'Course'
   );

} //end class