diff --git a/.classpath b/.classpath
index fe91ce2..2edea7a 100644
--- a/.classpath
+++ b/.classpath
@@ -44,5 +44,29 @@
 			<attribute name="maven.pomderived" value="true"/>
 		</attributes>
 	</classpathentry>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.6.1/gwt-user.jar">
+		<attributes>
+			<attribute name="javadoc_location" value="file:/home/giancarlo/gwt/gwt-2.6.1/doc/javadoc/"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.6.1/gwt-dev.jar">
+		<attributes>
+			<attribute name="javadoc_location" value="file:/home/giancarlo/gwt/gwt-2.6.1/doc/javadoc/"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.6.1/validation-api-1.0.0.GA.jar" sourcepath="/home/giancarlo/gwt/gwt-2.6.1/validation-api-1.0.0.GA-sources.jar"/>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.6.1/validation-api-1.0.0.GA-sources.jar"/>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.4.0/gwt-user.jar">
+		<attributes>
+			<attribute name="javadoc_location" value="file:/home/giancarlo/gwt/gwt-2.4.0/doc/javadoc/"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.4.0/gwt-dev.jar">
+		<attributes>
+			<attribute name="javadoc_location" value="file:/home/giancarlo/gwt/gwt-2.4.0/doc/javadoc/"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.4.0/validation-api-1.0.0.GA.jar" sourcepath="/home/giancarlo/gwt/gwt-2.4.0/validation-api-1.0.0.GA-sources.jar"/>
+	<classpathentry kind="lib" path="/home/giancarlo/gwt/gwt-2.4.0/validation-api-1.0.0.GA-sources.jar"/>
 	<classpathentry kind="output" path="target/tabular-data-column-widget-1.5.0-SNAPSHOT/WEB-INF/classes"/>
 </classpath>
diff --git a/.project b/.project
index ad2961e..df05e6c 100644
--- a/.project
+++ b/.project
@@ -47,7 +47,7 @@
 		<nature>org.eclipse.jdt.core.javanature</nature>
 		<nature>org.eclipse.m2e.core.maven2Nature</nature>
 		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
-		<nature>com.google.gwt.eclipse.core.gwtNature</nature>
 		<nature>org.eclipse.wst.jsdt.core.jsNature</nature>
+		<nature>com.google.gwt.eclipse.core.gwtNature</nature>
 	</natures>
 </projectDescription>
diff --git a/ColumnWidget.launch b/ColumnWidget.launch
index 224ac01..09bc55d 100644
--- a/ColumnWidget.launch
+++ b/ColumnWidget.launch
@@ -13,7 +13,7 @@
 </mapAttribute>
 <stringAttribute key="org.eclipse.jdt.launching.CLASSPATH_PROVIDER" value="com.google.gdt.eclipse.maven.mavenClasspathProvider"/>
 <stringAttribute key="org.eclipse.jdt.launching.MAIN_TYPE" value="com.google.gwt.dev.DevMode"/>
-<stringAttribute key="org.eclipse.jdt.launching.PROGRAM_ARGUMENTS" value="-remoteUI &quot;${gwt_remote_ui_server_port}:${unique_id}&quot; -startupUrl ColumnWidget.html -logLevel INFO -codeServerPort 9997 -port 8888 -war /home/giancarlo/workspace/tabular-data-column-widget/target/tabular-data-column-widget-1.0.0-SNAPSHOT org.gcube.portlets.user.td.columnwidget.ColumnWidget"/>
+<stringAttribute key="org.eclipse.jdt.launching.PROGRAM_ARGUMENTS" value="-remoteUI &quot;${gwt_remote_ui_server_port}:${unique_id}&quot; -startupUrl ColumnWidget.html -logLevel INFO -port 8888 -codeServerPort 9997 -war /home/giancarlo/workspace/tabular-data-column-widget/target/tabular-data-column-widget-1.0.0-SNAPSHOT org.gcube.portlets.user.td.columnwidget.ColumnWidget"/>
 <stringAttribute key="org.eclipse.jdt.launching.PROJECT_ATTR" value="tabular-data-column-widget"/>
 <stringAttribute key="org.eclipse.jdt.launching.VM_ARGUMENTS" value="-Xmx512m -Dgwt.nowarn.legacy.tools"/>
 </launchConfiguration>
diff --git a/pom.xml b/pom.xml
index f0975ef..018de8c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -45,13 +45,13 @@
 		<configDirectory>config</configDirectory>
 
 		<!-- Convenience property to set the GWT version -->
-		<gwtVersion>2.5.1</gwtVersion>
+		<!-- <gwtVersion>2.5.1</gwtVersion>
 		<gwtLogVersion>3.2.1</gwtLogVersion>
-		<gxtVersion>3.0.1</gxtVersion>
-		<!-- 
+		<gxtVersion>3.0.1</gxtVersion> -->
+		 
 		<gwtVersion>2.6.1</gwtVersion>
 		<gwtLogVersion>3.3.2</gwtLogVersion>
-		<gxtVersion>3.1.1</gxtVersion> -->
+		<gxtVersion>3.1.1</gxtVersion> 
 
 		<KEYS>${env.KEYS}</KEYS>
 
diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/batch/ReplaceBatchPanel.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/batch/ReplaceBatchPanel.java
index eef570b..62843c7 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/batch/ReplaceBatchPanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/batch/ReplaceBatchPanel.java
@@ -282,9 +282,11 @@ public class ReplaceBatchPanel extends FramedPanel implements
 		number.setWidth(50);
 		
 		//From gxt 3.1.1
-		//number.setCellClassName("");
-		//number.setCellPadding(true);
-		number.setColumnClassSuffix("");
+		number.setCellClassName("");
+		number.setCellPadding(true);
+		
+		//GXT 3.0.1
+		//number.setColumnClassSuffix("");
 		
 		number.setHeader("N.");
 		SafeStylesBuilder styleBuilder = new SafeStylesBuilder();