diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
index e9feced..35ded34 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/AppControllerExplorer.java
@@ -143,10 +143,9 @@ import org.gcube.portlets.widgets.fileupload.client.events.FileUploadCompleteEve
 import org.gcube.portlets.widgets.fileupload.client.events.FileUploadCompleteEventHandler;
 import org.gcube.portlets.widgets.fileupload.client.events.FileUploadSelectedEvent;
 import org.gcube.portlets.widgets.fileupload.client.events.FileUploadSelectedEventHandler;
-import org.gcube.portlets.widgets.workspacesharingwidget.client.SmartConstants;
-import org.gcube.portlets.widgets.workspacesharingwidget.client.WorkspaceSmartSharingController;
-import org.gcube.portlets.widgets.workspacesharingwidget.client.view.sharing.SmartShare;
-import org.gcube.portlets.widgets.workspacesharingwidget.shared.CredentialModel;
+import org.gcube.portlets.widgets.workspacesharingwidget.client.SimpleMultiDragConstants;
+import org.gcube.portlets.widgets.workspacesharingwidget.client.SimpleMultiDragWorkspaceContact;
+import org.gcube.portlets.widgets.workspacesharingwidget.client.SimpleMultiDragWorkspaceContact.LOAD_CONTACTS_AS;
 
 import com.extjs.gxt.ui.client.Registry;
 import com.extjs.gxt.ui.client.event.BaseEvent;
@@ -311,7 +310,7 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 						if(AppControllerExplorer.myLogin.compareToIgnoreCase(infoContactModel.getLogin())==0)
 							showAddAdministratorsDialog(file);
 						else
-							new MessageBoxAlert("Permission denied", "You have no permissions to add administrators. You are not manager of \""+file.getName()+"\"", null);
+							new MessageBoxAlert("Permission denied", "You have no permissions to manage administrators. You are not manager of \""+file.getName()+"\"", null);
 						
 					}
 				});
@@ -2110,60 +2109,73 @@ public class AppControllerExplorer implements EventHandler, TreeAppControllerInt
 	 */
 	private void showAddAdministratorsDialog(final FileModel file) {
 
-		final org.gcube.portlets.widgets.workspacesharingwidget.shared.FileModel internalFile = new org.gcube.portlets.widgets.workspacesharingwidget.shared.FileModel(file.getIdentifier(), file.getName(), file.isDirectory());
-
-		SmartConstants.HEADER_TITLE = "Add Administrators to: "+file.getName();
-		SmartConstants.SHARE_WITH_USERS = "Manage with users";
-		SmartConstants.ERROR_NO_USER_SELECTED = "You must pick at least one user to add to Administrators";
+		SimpleMultiDragConstants.HEADING_DIALOG = "Edit Administrator/s to: "+file.getName();
+		SimpleMultiDragConstants.ALL_CONTACTS_LEFT_LIST = "All Contacts";
+		SimpleMultiDragConstants.SHARE_WITH_RIGHT_LIST = "New Administrator/s";
 		
-		rpcWorkspaceService.getAdministratorsByFolderId(file.getIdentifier(), new AsyncCallback<List<InfoContactModel>>() {
-
+		final SimpleMultiDragWorkspaceContact multiDragContact = new SimpleMultiDragWorkspaceContact(LOAD_CONTACTS_AS.ADMINISTRATOR, file.getIdentifier(), true, false, true);
+		final Dialog multidrag = multiDragContact.getMultiDragContact();
+		
+		multidrag.getButtonById(Dialog.OK).addListener(Events.Select, new Listener<BaseEvent>() {
+			 
 			@Override
-			public void onFailure(Throwable arg0) {
-				// TODO Auto-generated method stub
+			public void handleEvent(BaseEvent be) {
+				List<org.gcube.portlets.widgets.workspacesharingwidget.shared.InfoContactModel> targets = multiDragContact.getTargetContactsWithMyLogin();
 				
-			}
+				if(targets.size()==1){
+					MessageBox info = MessageBox.info("Any Administrator/s?", "You have not selected any Administrator, confirm exit?", null);
+					
+					info.addCallback(new Listener<MessageBoxEvent>() {
 
-			@Override
-			public void onSuccess(List<InfoContactModel> admins) {
-				
-				List<CredentialModel> alreadyAdmins = new ArrayList<CredentialModel>();
-				for (InfoContactModel contact : admins) {
-					alreadyAdmins.add(new CredentialModel(contact.getId(), contact.getLogin(), contact.isGroup()));
-				}
-				
-				WorkspaceSmartSharingController controller = new WorkspaceSmartSharingController(internalFile, alreadyAdmins, false, false);
-				
-				final SmartShare sharingWindow = controller.getSharingDialog();
-				
-				sharingWindow.getButtonById(Dialog.OK).addListener(Events.Select, new Listener<BaseEvent>() {
-					 
-					@Override
-					public void handleEvent(BaseEvent be) {
-		 
-						if(sharingWindow.isValidForm(true)){
-							
-							List<org.gcube.portlets.widgets.workspacesharingwidget.shared.InfoContactModel> listUsers = sharingWindow.getSharedListUsers(); //@return the selected contacts (as InfoContactModel)
-							
-							if(listUsers!=null && listUsers.size()>0){
-								
-								List<String> logins = new ArrayList<String>(listUsers.size());
-								
-								for (org.gcube.portlets.widgets.workspacesharingwidget.shared.InfoContactModel infoContactModel : listUsers) {
-									logins.add(infoContactModel.getLogin());
-								}
-								
-								doAddAdministratorToFolderId(file, logins);
+						public void handleEvent(MessageBoxEvent be) {
+							//IF NOT CANCELLED
+							String clickedButton = be.getButtonClicked().getItemId();
+							if(clickedButton.equals(Dialog.OK)){
+								multidrag.hide();
 							}
 						}
-		 
+					});
+					
+					info.show();
+				}
+				
+				if(targets.size()>1){
+					
+					final List<String> logins = new ArrayList<String>(targets.size());
+					String names = "<ul>";
+					for (org.gcube.portlets.widgets.workspacesharingwidget.shared.InfoContactModel infoContactModel : targets) {
+						logins.add(infoContactModel.getLogin());
+						names+="<li><i>"+infoContactModel.getName() +";</i></li>";
 					}
-				});
-				
-				sharingWindow.show();
-				
+					
+					String tail = "</ul>as new ";
+					tail += logins.size()>1?"administrators":"administrator";
+					tail+= ", confirm?";
+					MessageBoxConfirm confirm = new MessageBoxConfirm("Setting new Administrator/s?", "You have selected: <br/>"+names +tail);
+					
+					confirm.getMessageBoxConfirm().addCallback(new Listener<MessageBoxEvent>() {
+
+						public void handleEvent(MessageBoxEvent be) {
+
+							//IF NOT CANCELLED
+							String clickedButton = be.getButtonClicked().getItemId();
+							if(clickedButton.equals(Dialog.YES)){
+								doAddAdministratorToFolderId(file, logins);
+								multidrag.hide();
+							}
+							if(clickedButton.equals(Dialog.CANCEL)){
+								multidrag.hide();
+							}
+							
+						}
+					});
+
+				}
+
 			}
 		});
+		
+		multidrag.show();
 	}
 	
 	
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/resources/Icons.java b/src/main/java/org/gcube/portlets/user/workspace/client/resources/Icons.java
index dd39b9f..2fbca1d 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/resources/Icons.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/resources/Icons.java
@@ -317,6 +317,9 @@ public interface Icons extends ClientBundle {
 	@Source("icons/add_admin.png")
 	ImageResource addAdmin();
 	
+	@Source("icons/admin_keys.png")
+	ImageResource manageAdmin();
+	
 	@Source("icons/specialfolder2.png")
 	ImageResource specialFolder();
 	
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/resources/Resources.java b/src/main/java/org/gcube/portlets/user/workspace/client/resources/Resources.java
index 283854a..12b564b 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/resources/Resources.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/resources/Resources.java
@@ -530,6 +530,13 @@ public class Resources {
 	public static AbstractImagePrototype getIconAddAdministrator() {
 		return AbstractImagePrototype.create(ICONS.addAdmin());
 	}
+	
+	/**
+	 * @return
+	 */
+	public static AbstractImagePrototype getIconManageAdministrator() {
+		return AbstractImagePrototype.create(ICONS.manageAdmin());
+	}
 
 	//ImageResources
 	public static ImageResource getImagePathSeparator(){
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/resources/icons/admin_keys.png b/src/main/java/org/gcube/portlets/user/workspace/client/resources/icons/admin_keys.png
new file mode 100644
index 0000000..da357f3
Binary files /dev/null and b/src/main/java/org/gcube/portlets/user/workspace/client/resources/icons/admin_keys.png differ
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/ContextMenuTree.java b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/ContextMenuTree.java
index effe804..aa607ab 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/ContextMenuTree.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/view/tree/ContextMenuTree.java
@@ -588,8 +588,8 @@ public class ContextMenuTree {
 		
 		MenuItem addAdministrator = new MenuItem();  
 //		addAdministrator.setId(WorkspaceOperation.ADD_ADMINISTRATOR.getId());
-		addAdministrator.setText("Add Administrator/s");  
-		addAdministrator.setIcon(Resources.getIconAddAdministrator());  
+		addAdministrator.setText("Manage Administrator/s");  
+		addAdministrator.setIcon(Resources.getIconManageAdministrator());  
 
 		addAdministrator.addSelectionListener(new SelectionListener<MenuEvent>() {  
 			public void componentSelected(MenuEvent ce) {