diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
index 40b43e9..90197ca 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeColumnTypePanel.java
@@ -475,7 +475,7 @@ public class ChangeColumnTypePanel extends FramedPanel implements
 		v.add(comboTimeDimensionTypeLabel, new VerticalLayoutData(1, -1,
 				new Margins(1)));
 		v.add(change, new VerticalLayoutData(-1, -1, new Margins(10, 0, 10, 0)));
-		add(v, new VerticalLayoutData(-1, -1, new Margins(0)));
+		add(v, new VerticalLayoutData(1, 1, new Margins(0)));
 
 		resetToInitialState();