Add the page parameter to the islandora_tabs hook call.

...  Facilitates implementation of equivalent functionality, where
the object was instantiated with the PID, and then the page was
passed to the method declared in your ISLANDORACM stream.

CollectionClass.inc

@@ -28,11 +28,9 @@ class CollectionClass {
    * @return CollectionClass
    */
   function __construct($pid = NULL) {
-    if (!empty($pid)) {
-      module_load_include('inc', 'fedora_repository', 'ObjectHelper');
-      $this->collectionObject = new ObjectHelper($pid);
-      $this->pid = $pid;
-    }
+    module_load_include('inc', 'fedora_repository', 'ObjectHelper');
+    $this->collectionObject = new ObjectHelper();
+    $this->pid = $pid;
   }
   
   public static function getCollectionQuery($pid) {

ObjectHelper.inc

@@ -32,8 +32,6 @@ class ObjectHelper {
     drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
     module_load_include('inc', 'fedora_repository', 'ConnectionHelper');
     $connectionHelper = new ConnectionHelper();
-    //$this->fedoraUser = $connectionHelper->getUser();
-    //$this->fedoraPass = $connectionHelper->getPassword();
   }
 
   /**

fedora_repository.module

@@ -1071,7 +1071,7 @@ function fedora_repository_get_items($pid = NULL, $dsId = NULL, $collection = NU
    $object_details = array();
   }
 
-  $hook_tabs = module_invoke_all('islandora_tabs', $content_models, $pid);
+  $hook_tabs = module_invoke_all('islandora_tabs', $content_models, $pid, $page_number);
   $cmodels_tabs = array_merge($cmodels_tabs, $object_details, $hook_tabs);
 
   return tabs_render($cmodels_tabs);