diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/DialogCodelistSelection.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/DialogCodelistSelection.java
index 54ac58b..152f612 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/DialogCodelistSelection.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/DialogCodelistSelection.java
@@ -6,6 +6,7 @@ import java.util.Iterator;
 import java.util.List;
 
 import org.gcube.portlets.user.td.columnwidget.client.resources.ResourceBundle;
+import org.gcube.portlets.user.td.columnwidget.client.utils.UtilsGXT3;
 import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.TabResource;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.paging.CodelistPagingLoadConfig;
@@ -27,7 +28,6 @@ import com.google.web.bindery.event.shared.EventBus;
 import com.sencha.gxt.core.client.IdentityValueProvider;
 import com.sencha.gxt.core.client.Style.SelectionMode;
 import com.sencha.gxt.core.client.resources.ThemeStyles;
-import com.sencha.gxt.core.client.util.Point;
 import com.sencha.gxt.data.client.loader.RpcProxy;
 import com.sencha.gxt.data.shared.ListStore;
 import com.sencha.gxt.data.shared.SortDir;
@@ -39,12 +39,9 @@ import com.sencha.gxt.data.shared.loader.PagingLoadResultBean;
 import com.sencha.gxt.data.shared.loader.PagingLoader;
 import com.sencha.gxt.widget.core.client.FramedPanel;
 import com.sencha.gxt.widget.core.client.Window;
-import com.sencha.gxt.widget.core.client.box.AlertMessageBox;
 import com.sencha.gxt.widget.core.client.button.TextButton;
 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.HideEvent;
-import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
 import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
 import com.sencha.gxt.widget.core.client.form.TextField;
@@ -264,7 +261,7 @@ public class DialogCodelistSelection extends Window {
 						Log.debug("Error Retrieving Codelist",
 								caught.getMessage());
 						caught.printStackTrace();
-						alert("Error Retrieving Codelist",
+						UtilsGXT3.alert("Error Retrieving Codelist",
 								"Error retrieving codelist on server");
 
 					}
@@ -290,7 +287,7 @@ public class DialogCodelistSelection extends Window {
 						Log.debug("Error in setCodelistsPagingLoader",
 								caught.getMessage());
 						caught.printStackTrace();
-						alert("Error Retrieving Codelist",
+						UtilsGXT3.alert("Error Retrieving Codelist",
 								"Error error in retrieving the codelists during the initialization phase!");
 
 					}
@@ -348,17 +345,7 @@ public class DialogCodelistSelection extends Window {
 
 	};
 
-	private void alert(String title, String message) {
-		final AlertMessageBox d = new AlertMessageBox(title, message);
-		d.addHideHandler(new HideHandler() {
-
-			public void onHide(HideEvent event) {
-
-			}
-		});
-		d.show();
-
-	}
+	
 
 	/**
 	 * {@inheritDoc}
diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/ChangeColumnTypeProgressDialog.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/ChangeColumnTypeProgressDialog.java
index 5a80162..ebb0755 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/ChangeColumnTypeProgressDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/ChangeColumnTypeProgressDialog.java
@@ -1,5 +1,6 @@
 package org.gcube.portlets.user.td.columnwidget.client.progress;
 
+import org.gcube.portlets.user.td.columnwidget.client.utils.UtilsGXT3;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.type.ChangeColumnTypeSession;
 import org.gcube.portlets.user.td.widgetcommonevent.client.event.ChangeTableRequestEvent;
 import org.gcube.portlets.user.td.widgetcommonevent.client.type.ChangeTableRequestType;
@@ -11,13 +12,10 @@ import com.sencha.gxt.core.client.util.Margins;
 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.box.AlertMessageBox;
 import com.sencha.gxt.widget.core.client.button.TextButton;
 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.HideEvent;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
-import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;
 import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
 
 
@@ -106,12 +104,7 @@ public class ChangeColumnTypeProgressDialog extends Window implements ChangeColu
 				String failureDetails) {
 			ok.setVisible(true);
 			this.trId=null;	
-			AlertMessageBox d = new AlertMessageBox("Error changing the column type", reason);
-			d.addHideHandler(new HideHandler() {
-				public void onHide(HideEvent event) {
-				}
-			});
-			d.show();
+			UtilsGXT3.alert("Error changing the column type", reason);
 		}
 		
 		public void updateInvocation(){
diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/DeleteColumnProgressDialog.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/DeleteColumnProgressDialog.java
index 8f73b21..0a097f8 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/DeleteColumnProgressDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/DeleteColumnProgressDialog.java
@@ -1,5 +1,6 @@
 package org.gcube.portlets.user.td.columnwidget.client.progress;
 
+import org.gcube.portlets.user.td.columnwidget.client.utils.UtilsGXT3;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.DeleteColumnSession;
 import org.gcube.portlets.user.td.widgetcommonevent.client.event.ChangeTableRequestEvent;
 import org.gcube.portlets.user.td.widgetcommonevent.client.type.ChangeTableRequestType;
@@ -11,13 +12,10 @@ import com.sencha.gxt.core.client.util.Margins;
 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.box.AlertMessageBox;
 import com.sencha.gxt.widget.core.client.button.TextButton;
 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.HideEvent;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
-import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;
 import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
 
 
@@ -106,12 +104,8 @@ public class DeleteColumnProgressDialog extends Window implements DeleteColumnPr
 				String failureDetails) {
 			ok.setVisible(true);
 			this.trId=null;
-			AlertMessageBox d = new AlertMessageBox("Error Deleting Column", reason);
-			d.addHideHandler(new HideHandler() {
-				public void onHide(HideEvent event) {	
-				}
-			});
-			d.show();
+			UtilsGXT3.alert("Error Deleting Column", reason);
+			
 		}
 		
 		public void updateInvocation(){
diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/LabelColumnProgressDialog.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/LabelColumnProgressDialog.java
index 9f3914e..3f61b53 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/LabelColumnProgressDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/progress/LabelColumnProgressDialog.java
@@ -1,5 +1,6 @@
 package org.gcube.portlets.user.td.columnwidget.client.progress;
 
+import org.gcube.portlets.user.td.columnwidget.client.utils.UtilsGXT3;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.column.LabelColumnSession;
 import org.gcube.portlets.user.td.widgetcommonevent.client.event.ChangeTableRequestEvent;
 import org.gcube.portlets.user.td.widgetcommonevent.client.type.ChangeTableRequestType;
@@ -107,12 +108,8 @@ public class LabelColumnProgressDialog extends Window implements LabelColumnProg
 				String failureDetails) {
 			ok.setVisible(true);
 			this.trId=null;
-			AlertMessageBox d = new AlertMessageBox("Error Changing The Column Label", reason);
-			d.addHideHandler(new HideHandler() {
-				public void onHide(HideEvent event) {	
-				}
-			});
-			d.show();
+			UtilsGXT3.alert("Error Changing The Column Label", reason);
+			
 		}
 		
 		public void updateInvocation(){