diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/CodelistSelectionDialog.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/CodelistSelectionDialog.java
index fba0e74..7804f44 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/CodelistSelectionDialog.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/dimension/CodelistSelectionDialog.java
@@ -111,6 +111,7 @@ public class CodelistSelectionDialog extends Window {
 		setResizable(false);
 		setHeadingText("Select Codelist");
 		setModal(true);
+		setZIndex(Integer.MAX_VALUE);
 	}
 
 	protected void create() {