diff --git a/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/GridOperationId.java b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/GridOperationId.java
new file mode 100644
index 0000000..15e3e35
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/widgetcommonevent/shared/GridOperationId.java
@@ -0,0 +1,28 @@
+package org.gcube.portlets.user.td.widgetcommonevent.shared;
+
+public enum GridOperationId {
+	EditRow("1"),
+	DeleteRow("2"),
+	AddRow("3");
+	
+	/**
+	 * Create OperationId
+	 * @param text
+	 */
+	private GridOperationId (final String id) {
+		this.id = id;
+	}
+
+	private final String id;
+	
+	/**
+	 * Return operation number
+	 */
+	@Override
+	public String toString() {
+		return id;
+	}
+	
+
+}
+