Add allowed_actions to make it work for 3.1

code/cms/DMSGridFieldDetailForm.php

@@ -4,7 +4,7 @@
  * Custom ItemRequest class the provides custom delete behaviour for the CMSFields of DMSDocument
  */
 class DMSGridFieldDetailForm_ItemRequest extends GridFieldDetailForm_ItemRequest {
-
+	private static $allowed_actions = array('ItemEditForm');
 
 	function ItemEditForm() {
 		$form = parent::ItemEditForm();
@@ -22,4 +22,4 @@ class DMSGridFieldDetailForm_ItemRequest extends GridFieldDetailForm_ItemRequest
 		return $form;
 	}
 
-}
+}