diff --git a/.classpath b/.classpath
index 5bf4492..e589261 100644
--- a/.classpath
+++ b/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="src" output="target/workspace-6.6.5-SNAPSHOT/WEB-INF/classes" path="src/main/java">
+	<classpathentry kind="src" output="target/workspace-6.6.7-SNAPSHOT/WEB-INF/classes" path="src/main/java">
 		<attributes>
 			<attribute name="optional" value="true"/>
 			<attribute name="maven.pomderived" value="true"/>
@@ -25,5 +25,5 @@
 			<attribute name="org.eclipse.jst.component.dependency" value="/WEB-INF/lib"/>
 		</attributes>
 	</classpathentry>
-	<classpathentry kind="output" path="target/workspace-6.6.5-SNAPSHOT/WEB-INF/classes"/>
+	<classpathentry kind="output" path="target/workspace-6.6.7-SNAPSHOT/WEB-INF/classes"/>
 </classpath>
diff --git a/.settings/com.google.gdt.eclipse.core.prefs b/.settings/com.google.gdt.eclipse.core.prefs
index e622e7e..b0171bc 100644
--- a/.settings/com.google.gdt.eclipse.core.prefs
+++ b/.settings/com.google.gdt.eclipse.core.prefs
@@ -3,6 +3,6 @@
 >>>>>>>=.r93212
 eclipse.preferences.version=1
 jarsExcludedFromWebInfLib=
-lastWarOutDir=/home/francesco-mangiacrapa/wseclipse/workspace-TRUNK/target/workspace-6.6.5-SNAPSHOT
+lastWarOutDir=/home/francesco-mangiacrapa/wseclipse/workspace-TRUNK/target/workspace-6.6.7-SNAPSHOT
 warSrcDir=src/main/webapp
 warSrcDirIsOutput=false
diff --git a/.settings/org.eclipse.wst.common.component b/.settings/org.eclipse.wst.common.component
index cd739a2..e7bf8c1 100644
--- a/.settings/org.eclipse.wst.common.component
+++ b/.settings/org.eclipse.wst.common.component
@@ -5,7 +5,10 @@
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/target/generated-sources/gwt"/>
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/java"/>
         <wb-resource deploy-path="/WEB-INF/classes" source-path="/src/main/resources"/>
-        <dependent-module archiveName="workspace-tree-widget-6.6.6-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/workspace-tree-widget-BRANCH-6.6.6-SNAPSHOT/workspace-tree-widget-BRANCH-6.6.6-SNAPSHOT">
+        <dependent-module archiveName="workspace-tree-widget-6.6.7-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/workspace-tree-widget-TRUNK/workspace-tree-widget-TRUNK">
+            <dependency-type>uses</dependency-type>
+        </dependent-module>
+        <dependent-module archiveName="workspace-sharing-widget-1.1.1-SNAPSHOT.jar" deploy-path="/WEB-INF/lib" handle="module:/resource/workspace-sharing-widget-TRUNK/workspace-sharing-widget-TRUNK">
             <dependency-type>uses</dependency-type>
         </dependent-module>
 
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/AppController.java b/src/main/java/org/gcube/portlets/user/workspace/client/AppController.java
index 53eebe9..9d027be 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/AppController.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/AppController.java
@@ -14,6 +14,8 @@ import org.gcube.portlets.user.workspace.client.event.AccountingReadersEvent;
 import org.gcube.portlets.user.workspace.client.event.AccountingReadersEventHandler;
 import org.gcube.portlets.user.workspace.client.event.ActiveGroupingView;
 import org.gcube.portlets.user.workspace.client.event.ActiveGroupingViewHandler;
+import org.gcube.portlets.user.workspace.client.event.AddAdministratorEvent;
+import org.gcube.portlets.user.workspace.client.event.AddAdministratorEventHandler;
 import org.gcube.portlets.user.workspace.client.event.AddFolderEvent;
 import org.gcube.portlets.user.workspace.client.event.AddFolderEventHandler;
 import org.gcube.portlets.user.workspace.client.event.AddSmartFolderEvent;
@@ -184,6 +186,18 @@ public class AppController implements SubscriberInterface {
 			}
 		});
 		
+		eventBus.addHandler(AddAdministratorEvent.TYPE, new AddAdministratorEventHandler() {
+			
+			@Override
+			public void onAddAdministrator(AddAdministratorEvent addAdministratorEvent) {
+				FileModel parent = wsPortlet.getToolBarPath().getLastParent();
+				
+				if(parent!=null)
+					AppControllerExplorer.getEventBus().fireEvent(new AddAdministratorEvent(parent));
+				
+			}
+		});
+		
 		eventBus.addHandler(TrashEvent.TYPE, new TrashEventHandler() {
 			
 			@Override
diff --git a/src/main/java/org/gcube/portlets/user/workspace/client/view/toolbars/GxtBottomToolBarItem.java b/src/main/java/org/gcube/portlets/user/workspace/client/view/toolbars/GxtBottomToolBarItem.java
index 31ebcfa..127d104 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/client/view/toolbars/GxtBottomToolBarItem.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/client/view/toolbars/GxtBottomToolBarItem.java
@@ -3,12 +3,14 @@ package org.gcube.portlets.user.workspace.client.view.toolbars;
 import org.gcube.portlets.user.workspace.client.AppController;
 import org.gcube.portlets.user.workspace.client.event.AccountingHistoryEvent;
 import org.gcube.portlets.user.workspace.client.event.AccountingReadersEvent;
+import org.gcube.portlets.user.workspace.client.event.AddAdministratorEvent;
 import org.gcube.portlets.user.workspace.client.event.GetInfoEvent;
 import org.gcube.portlets.user.workspace.client.event.TrashEvent;
 import org.gcube.portlets.user.workspace.client.resources.Resources;
 import org.gcube.portlets.user.workspace.client.util.GetPermissionIconByACL;
 import org.gcube.portlets.user.workspace.shared.WorkspaceACL;
 import org.gcube.portlets.user.workspace.shared.WorkspaceTrashOperation;
+import org.gcube.portlets.user.workspace.shared.WorkspaceACL.USER_TYPE;
 
 import com.extjs.gxt.ui.client.Style.HorizontalAlignment;
 import com.extjs.gxt.ui.client.event.BaseEvent;
@@ -44,6 +46,8 @@ public class GxtBottomToolBarItem extends ToolBar{
 	 * 
 	 */
 	protected static final String HISTORY = "History";
+	private static final String ADD_ADMINISTRATOR = "Add Admnistrator/s";
+	
 	private TextField<String> txfName = new TextField<String>();
 	private Text txtOwner = new Text("Empty");
 	private Text txtCreationTime = new Text("Empty");
@@ -56,6 +60,7 @@ public class GxtBottomToolBarItem extends ToolBar{
 	private ACLDivInfo aclDivInfo;
 	private Label labelItemsNumber = new Label();
 	private HorizontalPanel hpItemsNumber;
+	private Button btnAddAdmin;
 	
 	public GxtBottomToolBarItem(){
 		super();
@@ -113,6 +118,20 @@ public class GxtBottomToolBarItem extends ToolBar{
 
 			}
 		});
+		
+		
+		btnAddAdmin = new Button(ADD_ADMINISTRATOR);
+		btnAddAdmin.setIcon(Resources.getIconAddAdministrator());
+		btnAddAdmin.addSelectionListener(new SelectionListener<ButtonEvent>() {
+
+			@Override
+			public void componentSelected(ButtonEvent ce) {
+
+				AppController.getEventBus().fireEvent(new AddAdministratorEvent(null));
+			}
+		});
+		
+		setVisibleAddAdministrators(false);
 			
 		aclDivInfo = new ACLDivInfo("", null);
 		
@@ -148,12 +167,17 @@ public class GxtBottomToolBarItem extends ToolBar{
 		FillToolItem filler = new FillToolItem();
 		filler.setId("filler-item");
 		add(filler);
+		add(btnAddAdmin);
 		add(aclDivInfo);
 
 		enableInfoHistoryButtons(false);
 	
 	}
 	
+	private void setVisibleAddAdministrators(boolean bool){
+		btnAddAdmin.setVisible(bool);
+	}
+	
 
 	public void resetDetails(){
 		
@@ -194,12 +218,18 @@ public class GxtBottomToolBarItem extends ToolBar{
 	
 	
 	public void updateACLInfo(WorkspaceACL acl){
+		setVisibleAddAdministrators(false);
 		
 		if(acl==null){
 			aclDivInfo.updateInfo(null, null);
 			return;
 		}
 		AbstractImagePrototype img = GetPermissionIconByACL.getImage(acl);
+		
+		if(acl.getUserType().equals(USER_TYPE.ADMINISTRATOR)){
+			setVisibleAddAdministrators(true);
+		}
+		
 		aclDivInfo.updateInfo(acl.getLabel(), img);
 		this.layout();
 	}
diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml
index 912dccc..29095ec 100644
--- a/src/main/webapp/WEB-INF/web.xml
+++ b/src/main/webapp/WEB-INF/web.xml
@@ -17,25 +17,30 @@
 		<servlet-name>uploadprogress</servlet-name>
 		<servlet-class>org.gcube.portlets.widgets.fileupload.server.UploadProgressServlet</servlet-class>
 	</servlet>
- 
+
 	<servlet-mapping>
 		<servlet-name>uploadprogress</servlet-name>
 		<url-pattern>/workspace/uploadprogress</url-pattern>
 	</servlet-mapping>
- 
+
 	<!-- DO NOT CHANGE - DO NOT Replace URL PATTERN HERE -->
 	<servlet>
 		<servlet-name>upload</servlet-name>
 		<servlet-class>org.gcube.portlets.widgets.fileupload.server.UploadServlet</servlet-class>
 	</servlet>
- 
+
 	<servlet-mapping>
 		<servlet-name>upload</servlet-name>
 		<url-pattern>/FileUpload/upload</url-pattern>
 	</servlet-mapping>
- 
+
+	<servlet>
+		<servlet-name>workspacesharing</servlet-name>
+		<servlet-class>org.gcube.portlets.widgets.workspacesharingwidget.server.WorkspaceSharingServiceImpl</servlet-class>
+	</servlet>
+
 	<!-- END DO NOT CHANGE -->
-	
+
 	<servlet>
 		<servlet-name>UploadService</servlet-name>
 		<servlet-class>org.gcube.portlets.user.workspace.server.UploadServlet</servlet-class>
@@ -45,22 +50,21 @@
 		<servlet-name>UploadService</servlet-name>
 		<url-pattern>/workspace/UploadService</url-pattern>
 	</servlet-mapping>
-	
-	
 
-	
-	<servlet>
-		<servlet-name>LocalUploadService</servlet-name>
-		<servlet-class>org.gcube.portlets.user.workspace.server.LocalUploadServlet</servlet-class>
-	</servlet>
+	<servlet-mapping>
+		<servlet-name>workspacesharing</servlet-name>
+		<url-pattern>/workspace/workspacesharing</url-pattern>
+	</servlet-mapping>
 
 	<servlet-mapping>
 		<servlet-name>LocalUploadService</servlet-name>
 		<url-pattern>/workspace/LocalUploadService</url-pattern>
 	</servlet-mapping>
-	
-	
-	
+
+	<servlet>
+		<servlet-name>LocalUploadService</servlet-name>
+		<servlet-class>org.gcube.portlets.user.workspace.server.LocalUploadServlet</servlet-class>
+	</servlet>
 
 	<servlet>
 		<servlet-name>DownloadService</servlet-name>
@@ -153,7 +157,7 @@
 		<servlet-name>quicktourServlet</servlet-name>
 		<servlet-class>org.gcube.portlets.widgets.guidedtour.server.TourServiceImpl</servlet-class>
 	</servlet>
- 
+
 	<servlet-mapping>
 		<servlet-name>quicktourServlet</servlet-name>
 		<url-pattern>/workspace/quicktourServlet</url-pattern>