diff --git a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
index a1c57e7..057d61e 100644
--- a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnExpressionDialog.java
@@ -3,8 +3,6 @@ package org.gcube.portlets.user.td.expressionwidget.client;
 import org.gcube.portlets.user.td.expressionwidget.client.resource.ExpressionResources;
 import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
-import org.gcube.portlets.user.td.widgetcommonevent.client.event.ExpressionEvent;
-import org.gcube.portlets.user.td.widgetcommonevent.client.type.ExpressionType;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.expression.C_Expression;
 import org.gcube.portlets.user.td.widgetcommonevent.shared.tr.column.ColumnDataType;
@@ -15,6 +13,9 @@ import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.gwt.user.client.ui.HTML;
 import com.google.web.bindery.event.shared.EventBus;
 import com.sencha.gxt.widget.core.client.Window;
+import com.sencha.gxt.widget.core.client.box.AlertMessageBox;
+import com.sencha.gxt.widget.core.client.event.HideEvent;
+import com.sencha.gxt.widget.core.client.event.HideEvent.HideHandler;
 
 public class ColumnExpressionDialog extends Window {
 	protected String WIDTH = "650px";
@@ -48,8 +49,8 @@ public class ColumnExpressionDialog extends Window {
 		load(trId, columnName);
 
 	}
-	
-	protected void initWindow(){
+
+	protected void initWindow() {
 		setWidth(WIDTH);
 		setHeight(HEIGHT);
 		setBodyBorder(false);
@@ -80,6 +81,14 @@ public class ColumnExpressionDialog extends Window {
 			HTML errorMessage = new HTML(
 					"This type of column is not supported for now!");
 			add(errorMessage);
+			AlertMessageBox d = new AlertMessageBox("Error",
+					"This type of column is not supported for now!");
+			d.addHideHandler(new HideHandler() {
+				public void onHide(HideEvent event) {
+					hide();
+				}
+			});
+			d.show();
 		}
 	}
 
@@ -113,8 +122,4 @@ public class ColumnExpressionDialog extends Window {
 
 	}
 
-	
-
-	
-
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnFilterDialog.java b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnFilterDialog.java
index b41dfab..a903fe3 100644
--- a/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnFilterDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/expressionwidget/client/ColumnFilterDialog.java
@@ -32,9 +32,8 @@ public class ColumnFilterDialog extends Window {
 	private ColumnFilterSession columnFilterSession;
 	private ColumnFilterProgressDialog dialog;
 
-	public ColumnFilterDialog(String columnId,
-			ColumnTypeCode columnTypeCode, ColumnDataType dataTypeName,
-			EventBus eventBus) {
+	public ColumnFilterDialog(String columnId, ColumnTypeCode columnTypeCode,
+			ColumnDataType dataTypeName, EventBus eventBus) {
 		initWindow();
 		this.eventBus = eventBus;
 		column = new ColumnData();
@@ -45,8 +44,7 @@ public class ColumnFilterDialog extends Window {
 
 	}
 
-	public ColumnFilterDialog(TRId trId, String columnName,
-			EventBus eventBus) {
+	public ColumnFilterDialog(TRId trId, String columnName, EventBus eventBus) {
 		initWindow();
 		this.eventBus = eventBus;
 		this.trId = trId;
@@ -54,8 +52,8 @@ public class ColumnFilterDialog extends Window {
 		load(trId, columnName);
 
 	}
-	
-	protected void initWindow(){
+
+	protected void initWindow() {
 		setWidth(WIDTH);
 		setHeight(HEIGHT);
 		setBodyBorder(false);
@@ -79,18 +77,27 @@ public class ColumnFilterDialog extends Window {
 						ColumnTypeCode.CODENAME.toString()) == 0
 				|| column.getTypeCode().compareTo(
 						ColumnTypeCode.MEASURE.toString()) == 0) {
-			columnExpressionPanel = new ColumnExpressionPanel(this, column, eventBus);
+			columnExpressionPanel = new ColumnExpressionPanel(this, column,
+					eventBus);
 			add(columnExpressionPanel);
-			if(columnExpressionPanel.getBtnSave()!=null){
+			if (columnExpressionPanel.getBtnSave() != null) {
 				columnExpressionPanel.getBtnSave().setVisible(false);
 			}
-			if(columnExpressionPanel.getBtnSearch()!=null){
+			if (columnExpressionPanel.getBtnSearch() != null) {
 				columnExpressionPanel.getBtnSearch().setVisible(false);
 			}
 		} else {
 			HTML errorMessage = new HTML(
 					"This type of column is not supported for now!");
 			add(errorMessage);
+			AlertMessageBox d = new AlertMessageBox("Error",
+					"This type of column is not supported for now!");
+			d.addHideHandler(new HideHandler() {
+				public void onHide(HideEvent event) {
+					hide();
+				}
+			});
+			d.show();
 		}
 	}
 
@@ -102,18 +109,15 @@ public class ColumnFilterDialog extends Window {
 		Log.debug("New Expression set:" + exp.toString());
 		this.exp = exp;
 	}
-	
-	protected void applyFilter(C_Expression exp){
-		this.exp=exp;
+
+	protected void applyFilter(C_Expression exp) {
+		this.exp = exp;
 		callApplyFilter();
 	}
-	
-	
-	protected void close(){
-		
-	}
-	
 
+	protected void close() {
+
+	}
 
 	protected void load(TRId trId, String columnName) {
 		TDGWTServiceAsync.INSTANCE.getColumn(trId, columnName,
@@ -122,9 +126,10 @@ public class ColumnFilterDialog extends Window {
 					public void onFailure(Throwable caught) {
 						Log.error("Error retrieving column: "
 								+ caught.getMessage());
-						AlertMessageBox d = new AlertMessageBox("Error retrieving column", caught.getMessage());
+						AlertMessageBox d = new AlertMessageBox(
+								"Error retrieving column", caught.getMessage());
 						d.addHideHandler(new HideHandler() {
-							public void onHide(HideEvent event) {	
+							public void onHide(HideEvent event) {
 								hide();
 							}
 						});
@@ -141,42 +146,39 @@ public class ColumnFilterDialog extends Window {
 
 	}
 
-	
-
-
 	protected void callApplyFilter() {
-		columnFilterSession= new ColumnFilterSession(column,exp);
-		ExpressionServiceAsync.INSTANCE.submitColumnFilter(columnFilterSession, new AsyncCallback<Void>() {
-			
-			@Override
-			public void onSuccess(Void result) {
-				Log.debug("Submitted column filter");
-				callColumnFilterProgressDialog();
-			}
-			
-			@Override
-			public void onFailure(Throwable caught) {
-				Log.error("Error submitting the column filter: "
-						+ caught.getMessage());
-				AlertMessageBox d = new AlertMessageBox("Error submitting the column filter", caught.getMessage());
-				d.addHideHandler(new HideHandler() {
-					public void onHide(HideEvent event) {
-						hide();
+		columnFilterSession = new ColumnFilterSession(column, exp);
+		ExpressionServiceAsync.INSTANCE.submitColumnFilter(columnFilterSession,
+				new AsyncCallback<Void>() {
+
+					@Override
+					public void onSuccess(Void result) {
+						Log.debug("Submitted column filter");
+						callColumnFilterProgressDialog();
+					}
+
+					@Override
+					public void onFailure(Throwable caught) {
+						Log.error("Error submitting the column filter: "
+								+ caught.getMessage());
+						AlertMessageBox d = new AlertMessageBox(
+								"Error submitting the column filter", caught
+										.getMessage());
+						d.addHideHandler(new HideHandler() {
+							public void onHide(HideEvent event) {
+								hide();
+							}
+						});
+						d.show();
+
 					}
 				});
-				d.show();
-				
-			}
-		});
-			
-		
+
 	}
-	
-	protected void callColumnFilterProgressDialog(){
-		dialog=new ColumnFilterProgressDialog(this,eventBus);
+
+	protected void callColumnFilterProgressDialog() {
+		dialog = new ColumnFilterProgressDialog(this, eventBus);
 		dialog.show();
 	}
 
-	
-
 }