<?php

	class Extension_CoreDevKit extends Extension {
	/*-------------------------------------------------------------------------
		Definition:
	-------------------------------------------------------------------------*/

		public function getSubscribedDelegates() {
			return array(
						array(
							'page'		=> '/backend/',
							'delegate'	=> 'InitaliseAdminPageHead',
							'callback'	=> 'initaliseAdminPageHead'
						),
					);
		}

		public function initaliseAdminPageHead($context) {
			error_reporting(E_ALL);
			ini_set('display_errors', 1);
		}

	}

?>
<?php

	class Extension_CoreDevKit extends Extension {
	/*-------------------------------------------------------------------------
		Definition:
	-------------------------------------------------------------------------*/

		public function getSubscribedDelegates() {
		}
	}

?>
--- 
+++ 
@@ -6,7 +6,20 @@
 	-------------------------------------------------------------------------*/
 
 		public function getSubscribedDelegates() {
+			return array(
+						array(
+							'page'		=> '/backend/',
+							'delegate'	=> 'InitaliseAdminPageHead',
+							'callback'	=> 'initaliseAdminPageHead'
+						),
+					);
 		}
+
+		public function initaliseAdminPageHead($context) {
+			error_reporting(E_ALL);
+			ini_set('display_errors', 1);
+		}
+
 	}
 
 ?>
Enable Errors when extension is enabled
