diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ChangeTableRequestEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ChangeTableRequestEvent.java
index 9a3557e..1497b73 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ChangeTableRequestEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ChangeTableRequestEvent.java
@@ -63,4 +63,13 @@ public class ChangeTableRequestEvent extends GwtEvent<ChangeTableRequestEvent.Ch
 	public void setTrId(TRId trId) {
 		this.trId = trId;
 	}
+
+	@Override
+	public String toString() {
+		return "ChangeTableRequestEvent [changeTableRequestType="
+				+ changeTableRequestType + ", trId=" + trId + "]";
+	}
+	
+	
+	
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ExpressionEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ExpressionEvent.java
new file mode 100644
index 0000000..a257d7d
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/ExpressionEvent.java
@@ -0,0 +1,94 @@
+package org.gcube.portlets.user.td.widgetcommonevent.client.event;
+
+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_ExpressionContainer;
+
+import com.google.gwt.event.shared.EventHandler;
+import com.google.gwt.event.shared.GwtEvent;
+import com.google.gwt.event.shared.HandlerRegistration;
+import com.google.gwt.event.shared.HasHandlers;
+
+/**
+ * 
+ * @author "Giancarlo Panichi" 
+ * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
+ *
+ */
+public class ExpressionEvent extends GwtEvent<ExpressionEvent.ExpressionEventHandler> {
+
+	public static Type<ExpressionEventHandler> TYPE = new Type<ExpressionEventHandler>();
+	private ExpressionType expressionType;
+	private TRId trId;
+	private String columnName;
+	private C_ExpressionContainer c_ExpressionContainer;
+	
+	public interface ExpressionEventHandler extends EventHandler {
+		void onExpression(ExpressionEvent event);
+	}
+
+	public interface HasExpressionEventHandler extends HasHandlers{
+		public HandlerRegistration addExpressionEventHandler(ExpressionEventHandler handler);
+	}
+	
+	public ExpressionEvent(ExpressionType expressionType) {
+		this.expressionType = expressionType;
+	}
+
+	public ExpressionType getExpressionType() {
+		return expressionType;
+	}
+
+	@Override
+	protected void dispatch(ExpressionEventHandler handler) {
+		handler.onExpression(this);
+	}
+
+	@Override
+	public Type<ExpressionEventHandler> getAssociatedType() {
+		return TYPE;
+	}
+
+	public static Type<ExpressionEventHandler> getType() {
+		return TYPE;
+	}
+
+	public static void fire(HasHandlers source, ExpressionType expressionType) {
+		source.fireEvent(new ExpressionEvent(expressionType));
+	}
+	
+	public TRId getTrId() {
+		return trId;
+	}
+
+	public void setTrId(TRId trId) {
+		this.trId = trId;
+	}
+	
+	public String getColumnName() {
+		return columnName;
+	}
+
+	public void setColumnName(String columnName) {
+		this.columnName = columnName;
+	}
+
+	public C_ExpressionContainer getC_ExpressionContainer() {
+		return c_ExpressionContainer;
+	}
+
+	public void setC_ExpressionContainer(C_ExpressionContainer c_ExpressionContainer) {
+		this.c_ExpressionContainer = c_ExpressionContainer;
+	}
+
+	@Override
+	public String toString() {
+		return "ExpressionEvent [expressionType=" + expressionType + ", trId="
+				+ trId + ", columnName=" + columnName
+				+ ", c_ExpressionContainer=" + c_ExpressionContainer + "]";
+	}
+	
+	
+	
+
+}
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/GridHeaderColumnMenuItemEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/GridHeaderColumnMenuItemEvent.java
index cdbf7d9..666777c 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/GridHeaderColumnMenuItemEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/GridHeaderColumnMenuItemEvent.java
@@ -75,6 +75,14 @@ public class GridHeaderColumnMenuItemEvent extends GwtEvent<GridHeaderColumnMenu
 		return operationId;
 	}
 
+	@Override
+	public String toString() {
+		return "GridHeaderColumnMenuItemEvent [itemType=" + itemType
+				+ ", columnSelected=" + columnSelected + ", operationId="
+				+ operationId + "]";
+	}
+	
+	
 		
 	
 }
\ No newline at end of file
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/RibbonEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/RibbonEvent.java
index 7435b24..9a6bb85 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/RibbonEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/RibbonEvent.java
@@ -51,4 +51,12 @@ public class RibbonEvent extends GwtEvent<RibbonEvent.RibbonEventHandler> {
 	public static void fire(HasHandlers source, RibbonType ribbonType) {
 		source.fireEvent(new RibbonEvent(ribbonType));
 	}
+
+	@Override
+	public String toString() {
+		return "RibbonEvent [ribbonType=" + ribbonType + "]";
+	}
+	
+	
+	
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/TasksMonitorEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/TasksMonitorEvent.java
index 1f0c10d..27141d7 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/TasksMonitorEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/TasksMonitorEvent.java
@@ -63,4 +63,13 @@ public class TasksMonitorEvent extends GwtEvent<TasksMonitorEvent.TasksMonitorEv
 	public void setTrId(TRId trId) {
 		this.trId = trId;
 	}
+
+	@Override
+	public String toString() {
+		return "TasksMonitorEvent [taskType=" + taskType + ", trId=" + trId
+				+ "]";
+	}
+	
+	
+	
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/UIStateEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/UIStateEvent.java
index fda4b4e..b4af9e8 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/UIStateEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/UIStateEvent.java
@@ -64,4 +64,13 @@ public class UIStateEvent extends GwtEvent<UIStateEvent.UIStateHandler> {
 		this.trId = trId;
 	}
 
+	@Override
+	public String toString() {
+		return "UIStateEvent [uiStateType=" + uiStateType + ", trId=" + trId
+				+ "]";
+	}
+	
+	
+	
+
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/WidgetRequestEvent.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/WidgetRequestEvent.java
index 08e4bb2..5a68db6 100644
--- a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/WidgetRequestEvent.java
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/event/WidgetRequestEvent.java
@@ -10,25 +10,27 @@ import com.google.gwt.event.shared.HasHandlers;
 
 /**
  * 
- * @author "Giancarlo Panichi" 
- * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
- *
+ * @author "Giancarlo Panichi" <a
+ *         href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a>
+ * 
  */
-public class WidgetRequestEvent extends GwtEvent<WidgetRequestEvent.WidgetRequestEventHandler> {
+public class WidgetRequestEvent extends
+		GwtEvent<WidgetRequestEvent.WidgetRequestEventHandler> {
 
 	public static Type<WidgetRequestEventHandler> TYPE = new Type<WidgetRequestEventHandler>();
 	private WidgetRequestType widgetRequestType;
 	private TRId trId;
 	private String columnName;
-	
+
 	public interface WidgetRequestEventHandler extends EventHandler {
 		void onWidgetRequest(WidgetRequestEvent event);
 	}
 
-	public interface HasWidgetRequestEventHandler extends HasHandlers{
-		public HandlerRegistration addWidgetRequestEventHandler(WidgetRequestEventHandler handler);
+	public interface HasWidgetRequestEventHandler extends HasHandlers {
+		public HandlerRegistration addWidgetRequestEventHandler(
+				WidgetRequestEventHandler handler);
 	}
-	
+
 	public WidgetRequestEvent(WidgetRequestType closeType) {
 		this.widgetRequestType = closeType;
 	}
@@ -51,10 +53,11 @@ public class WidgetRequestEvent extends GwtEvent<WidgetRequestEvent.WidgetReques
 		return TYPE;
 	}
 
-	public static void fire(HasHandlers source, WidgetRequestType widgetRequestType) {
+	public static void fire(HasHandlers source,
+			WidgetRequestType widgetRequestType) {
 		source.fireEvent(new WidgetRequestEvent(widgetRequestType));
 	}
-	
+
 	public TRId getTrId() {
 		return trId;
 	}
@@ -62,7 +65,7 @@ public class WidgetRequestEvent extends GwtEvent<WidgetRequestEvent.WidgetReques
 	public void setTrId(TRId trId) {
 		this.trId = trId;
 	}
-	
+
 	public String getColumnName() {
 		return columnName;
 	}
@@ -71,4 +74,10 @@ public class WidgetRequestEvent extends GwtEvent<WidgetRequestEvent.WidgetReques
 		this.columnName = columnName;
 	}
 
+	@Override
+	public String toString() {
+		return "WidgetRequestEvent [widgetRequestType=" + widgetRequestType
+				+ ", trId=" + trId + ", columnName=" + columnName + "]";
+	}
+
 }
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/type/ExpressionType.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/type/ExpressionType.java
new file mode 100644
index 0000000..bfbf003
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/client/type/ExpressionType.java
@@ -0,0 +1,13 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.widgetcommonevent.client.type;
+
+/**
+ * @author Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
+ * @Dec 9, 2013
+ *
+ */
+public enum ExpressionType {
+	CREATECOLUMNEXPRESSION;
+}
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java
new file mode 100644
index 0000000..ddbe10f
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_Expression.java
@@ -0,0 +1,23 @@
+package org.gcube.portlets.user.td.widgetcommonevent.shared.expression;
+
+import java.io.Serializable;
+
+public class C_Expression implements Serializable{
+
+	
+	private static final long serialVersionUID = 7818512507606450235L;
+	
+	protected String id="Expression";
+
+	public String getId() {
+		return id;
+	}
+
+
+	@Override
+	public String toString() {
+		return "Expression [id=" + id + "]";
+	}
+	
+
+}
diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_ExpressionContainer.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_ExpressionContainer.java
new file mode 100644
index 0000000..d875eaf
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/expression/C_ExpressionContainer.java
@@ -0,0 +1,39 @@
+package org.gcube.portlets.user.td.widgetcommonevent.shared.expression;
+
+import java.io.Serializable;
+
+
+
+public class C_ExpressionContainer implements Serializable {
+
+	private static final long serialVersionUID = -4021332410069520707L;
+
+	public enum Contains {
+		C_Expression, Rule;
+	}
+
+	protected Contains id;
+	protected C_Expression exp;
+
+	public Contains getId() {
+		return id;
+	}
+
+	public void setId(Contains id) {
+		this.id = id;
+	}
+
+	public C_Expression getExp() {
+		return exp;
+	}
+
+	public void setExp(C_Expression exp) {
+		this.exp = exp;
+	}
+
+	@Override
+	public String toString() {
+		return "C_ExpressionContainer [id=" + id + ", exp=" + exp + "]";
+	}
+
+}