Hi there,

I have a dataobject called Sizes that stores the width and height of an object. I want to be able to show the square meters as a total in model admin, How do i do that:

class Sizes extends DataObject {
	
	static $db = array(
	'Width'=>'Decimal',
	'Height'=> 'Decimal',
	);

And in model admin i have

class SizesAdmin extends ModelAdmin {
  static $managed_models = array('Sizes'); 
  static $url_segment = 'sizes'; 
  static $menu_title = 'Sizes';