diff --git a/openbis-ipad/openBIS/openBIS.xcodeproj/project.xcworkspace/xcuserdata/cramakri.xcuserdatad/UserInterfaceState.xcuserstate b/openbis-ipad/openBIS/openBIS.xcodeproj/project.xcworkspace/xcuserdata/cramakri.xcuserdatad/UserInterfaceState.xcuserstate
index 6357e97f0c763da8619029307aa7bafb2f520e62..998c90556fb07dc7c49edf82981a8546cbdf8422 100644
Binary files a/openbis-ipad/openBIS/openBIS.xcodeproj/project.xcworkspace/xcuserdata/cramakri.xcuserdatad/UserInterfaceState.xcuserstate and b/openbis-ipad/openBIS/openBIS.xcodeproj/project.xcworkspace/xcuserdata/cramakri.xcuserdatad/UserInterfaceState.xcuserstate differ
diff --git a/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.h b/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.h
index 0ff265b163aaa82c3d2379107d98dcb25ac460e7..245d5ddba823aec5e95eb8904c1af8b3d766518d 100644
--- a/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.h
+++ b/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.h
@@ -31,7 +31,7 @@
 @property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
 @property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
 @property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
-@property (readonly, strong, nonatomic) CISDOBOpenBisModel *openBisModel;
+@property (readonly, strong, nonatomic) CISDOBOpenBisModel *rootOpenBisModel;
 
 - (void)saveContext;
 - (NSURL *)applicationDocumentsDirectory;
diff --git a/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.m b/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.m
index 6bbbfa69db87c53f6f107e7ad2d7d749d63576a7..897e82afe5e07fe4322a93335d8bb4e588551156 100644
--- a/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.m
+++ b/openbis-ipad/openBIS/openBIS/CISDOBAppDelegate.m
@@ -31,7 +31,7 @@
 @synthesize managedObjectContext = _managedObjectContext;
 @synthesize managedObjectModel = _managedObjectModel;
 @synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
-@synthesize openBisModel = _openBisModel;
+@synthesize rootOpenBisModel = _rootOpenBisModel;
 
 - (CISDOBMasterViewController *)masterViewController
 {
@@ -55,7 +55,7 @@
 {
     // Initialize the controller
     CISDOBMasterViewController *controller = [self masterViewController];
-    controller.openBisModel = self.openBisModel;
+    controller.openBisModel = self.rootOpenBisModel;
     return YES;
 }
 							
@@ -147,14 +147,14 @@
     return _persistentStoreCoordinator;
 }
 
-- (CISDOBOpenBisModel *)openBisModel
+- (CISDOBOpenBisModel *)rootOpenBisModel
 {
-    if (_openBisModel != nil) return _openBisModel;
+    if (_rootOpenBisModel != nil) return _rootOpenBisModel;
     
-    _openBisModel = [[CISDOBOpenBisModel alloc] init];
-    _openBisModel.managedObjectContext = self.managedObjectContext;
+    _rootOpenBisModel = [[CISDOBOpenBisModel alloc] init];
+    _rootOpenBisModel.managedObjectContext = self.managedObjectContext;
     
-    return _openBisModel;
+    return _rootOpenBisModel;
 }
 
 #pragma mark - Application's Documents directory
diff --git a/openbis-ipad/openBIS/openBIS/CISDOBMasterViewController.m b/openbis-ipad/openBIS/openBIS/CISDOBMasterViewController.m
index 5c20e1456486c22f854bf1e252ea85a5553fa65b..9cb05c326da9586974f128f8a233723a7b42c676 100644
--- a/openbis-ipad/openBIS/openBIS/CISDOBMasterViewController.m
+++ b/openbis-ipad/openBIS/openBIS/CISDOBMasterViewController.m
@@ -162,7 +162,7 @@
 
 - (void)initializeDrillDownFrom:(CISDOBMasterViewController *)parent
 {
-    self.openBisModel = parent.openBisModel;
+    self.openBisModel = [[CISDOBOpenBisModel alloc] initWithParentModel: parent.openBisModel];
     self.title = self.openBisModel.selectedObject.summaryHeader;
 }
 
diff --git a/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.h b/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.h
index e1b5e6334f5de4c51ea20e630276701fc86d2565..30341231f423e39c333f846094e392eda3eea9cb 100644
--- a/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.h
+++ b/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.h
@@ -30,12 +30,17 @@
  */
 @interface CISDOBOpenBisModel : NSObject <NSFetchedResultsControllerDelegate> {
     CISDOBIpadEntity *_selectedObject;
+    CISDOBOpenBisModel *_parentModel;
 }
 
 @property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
 @property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
 @property (weak, nonatomic) id <NSFetchedResultsControllerDelegate> delegate;
-@property (readonly) CISDOBIpadEntity *selectedObject;
+
+@property (readonly) CISDOBOpenBisModel *parentModel;
+
+// Initialize
+- (id)initWithParentModel:(CISDOBOpenBisModel *)parentModel;
 
 // Model
 - (NSInteger)numberOfSections; //!< Get the number of categories for the current selection
@@ -44,6 +49,8 @@
 - (CISDOBIpadEntity *)objectAtIndexPath:(NSIndexPath *)indexPath;
 
 // Selection
+@property (readonly) CISDOBIpadEntity *selectedObject;
+
 //! Select the object and return it
 - (CISDOBIpadEntity *)selectObjectAtIndexPath:(NSIndexPath *)indexPath;
 - (BOOL)isSelectionGroup; //!< Return YES if the selected object is a group (has children)
diff --git a/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.m b/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.m
index 317edfe395633357f5489596384c0aaa06a7497c..3bf0b6283ff5371152b6400a3adb9f84ae374698 100644
--- a/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.m
+++ b/openbis-ipad/openBIS/openBIS/CISDOBOpenBisModel.m
@@ -23,8 +23,28 @@
 #import "CISDOBOpenBisModel.h"
 #import "CISDOBIpadEntity.h"
 
+@interface CISDOBOpenBisModel (CISDOBOpenBisModelPrivate)
+@property (weak, nonatomic) CISDOBOpenBisModel *parentModel;
+@end
+
 @implementation CISDOBOpenBisModel
 
+#pragma mark - Initialize
+- (id)initWithParentModel:(CISDOBOpenBisModel *)parentModel
+{
+    if (!(self = [super init])) return nil;
+    
+    _parentModel = parentModel;
+    _selectedObject = nil;
+    
+    if (_parentModel) {
+        self.fetchedResultsController = parentModel.fetchedResultsController;
+        self.managedObjectContext = parentModel.managedObjectContext;
+    }
+    
+    return self;
+}
+
 #pragma mark - Model
 - (NSInteger)numberOfSections
 {