diff --git a/src/main/java/org/gcube/portlets/user/td/monitorwidget/client/ProgressDialog.java b/src/main/java/org/gcube/portlets/user/td/monitorwidget/client/ProgressDialog.java
index f4b6571..d0639d0 100644
--- a/src/main/java/org/gcube/portlets/user/td/monitorwidget/client/ProgressDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/monitorwidget/client/ProgressDialog.java
@@ -1,9 +1,7 @@
 package org.gcube.portlets.user.td.monitorwidget.client;
 
-
 import java.util.ArrayList;
 
-import org.gcube.portlets.user.td.gwtservice.shared.UIOperationsId;
 import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTSessionExpiredException;
 import org.gcube.portlets.user.td.gwtservice.shared.monitor.OperationMonitorSession;
 import org.gcube.portlets.user.td.widgetcommonevent.client.event.SessionExpiredEvent;
@@ -17,6 +15,7 @@ import com.sencha.gxt.widget.core.client.FramedPanel;
 import com.sencha.gxt.widget.core.client.ProgressBar;
 import com.sencha.gxt.widget.core.client.Window;
 import com.sencha.gxt.widget.core.client.button.TextButton;
+import com.sencha.gxt.widget.core.client.button.ToolButton;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
@@ -29,27 +28,26 @@ import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
  *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
  * 
  */
-public class ProgressDialog extends Window implements
-		ProgressListener  {
-	protected ArrayList<ProgressDialogListener> listeners = new ArrayList<ProgressDialogListener>();
+public class ProgressDialog extends Window implements ProgressListener {
 	
 	public static final int STATUS_POLLING_DELAY = 1000;
-	protected String WIDTH = "400px";
-	protected String HEIGHT = "120px";
-	protected EventBus eventBus;
-	protected UIOperationsId opertionId;
-	protected ProgressUpdater progressUpdater;
-	protected TextButton ok;
-	protected TRId trId;
+	private static final String WIDTH = "400px";
+	private static final String HEIGHT = "120px";
+	private EventBus eventBus;
+	private ProgressUpdater progressUpdater;
+	private TextButton ok;
+	private TRId trId;
 	private String reason;
 	private String details;
-
 	
-
-	public ProgressDialog(UIOperationsId operationId,
-			EventBus eventBus) {
+	protected boolean backgroundBtnEnabled=true;
+	protected ToolButton backgroundBtn;
+	
+	protected ArrayList<ProgressDialogListener> listeners = new ArrayList<ProgressDialogListener>();
+	
+	
+	public ProgressDialog(String taskId, EventBus eventBus) {
 		this.eventBus = eventBus;
-		this.opertionId=operationId;
 		setWidth(WIDTH);
 		setHeight(HEIGHT);
 		setBodyBorder(false);
@@ -82,11 +80,11 @@ public class ProgressDialog extends Window implements
 		panel.add(v);
 		panel.addButton(ok);
 		add(panel);
-		
-		OperationMonitorSession operationMonitorSession=new OperationMonitorSession(operationId);
+
+		OperationMonitorSession operationMonitorSession = new OperationMonitorSession(
+				taskId);
 		progressUpdater = new ProgressUpdater(operationMonitorSession);
-		progressUpdater.addListener(new ProgressBarUpdater(
-				progressBar));
+		progressUpdater.addListener(new ProgressBarUpdater(progressBar));
 
 		progressUpdater.addListener(this);
 		progressUpdater.scheduleRepeating(STATUS_POLLING_DELAY);
@@ -94,15 +92,15 @@ public class ProgressDialog extends Window implements
 		ok.setVisible(false);
 
 	}
-	
+
 	public void addProgressDialogListener(ProgressDialogListener listener) {
 		listeners.add(listener);
 	}
-	
+
 	public void removeProgressDialogListener(ProgressDialogListener listener) {
 		listeners.remove(listener);
 	}
-	
+
 	@Override
 	public void operationInitializing() {
 		// TODO Auto-generated method stub
@@ -130,9 +128,9 @@ public class ProgressDialog extends Window implements
 			eventBus.fireEvent(new SessionExpiredEvent(
 					SessionExpiredType.EXPIREDONSERVER));
 		} else {
-			fireOperationFailed(caught,reason);
+			fireOperationFailed(caught, reason);
 			hide();
-			
+
 		}
 	}
 
@@ -149,10 +147,10 @@ public class ProgressDialog extends Window implements
 		Log.debug("Operation Stopped: [" + trId.toString() + ", " + reason
 				+ ", " + details + "]");
 		this.trId = trId;
-		this.reason=reason;
-		this.details=details;
+		this.reason = reason;
+		this.details = details;
 		ok.setVisible(true);
-		
+
 	}
 
 	@Override
@@ -166,7 +164,7 @@ public class ProgressDialog extends Window implements
 		// TODO Auto-generated method stub
 
 	}
-	
+
 	protected void fireOperationComplete(TRId trId) {
 		for (ProgressDialogListener listener : listeners)
 			listener.operationComplete(trId);
@@ -176,11 +174,45 @@ public class ProgressDialog extends Window implements
 		for (ProgressDialogListener listener : listeners)
 			listener.operationFailed(caught, reason);
 	}
-	
+
 	protected void fireOperationStopped(TRId trId, String reason, String details) {
 		for (ProgressDialogListener listener : listeners)
-			listener.operationStopped(trId,reason, details);
+			listener.operationStopped(trId, reason, details);
 	}
-	
-	
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	protected void initTools() {
+		if (backgroundBtnEnabled) {
+			backgroundBtn = new ToolButton(ToolButton.CLOSE);
+			backgroundBtn.setToolTip("Put in the background");
+			backgroundBtn.addSelectHandler(new SelectHandler() {
+
+				@Override
+				public void onSelect(SelectEvent event) {
+					hide();
+				}
+			});
+
+			header.addTool(backgroundBtn);
+		}
+		
+		super.initTools();
+
+		closeBtn.addSelectHandler(new SelectHandler() {
+
+			public void onSelect(SelectEvent event) {
+				close();
+			}
+		});
+
+	}
+
+	protected void close() {
+		hide();
+
+	}
+
 }