diff --git a/src/main/java/org/gcube/portlets/user/td/extractcodelistwidget/client/TargetColumnsSelectionPanel.java b/src/main/java/org/gcube/portlets/user/td/extractcodelistwidget/client/TargetColumnsSelectionPanel.java
index 656bc54..90d85bb 100644
--- a/src/main/java/org/gcube/portlets/user/td/extractcodelistwidget/client/TargetColumnsSelectionPanel.java
+++ b/src/main/java/org/gcube/portlets/user/td/extractcodelistwidget/client/TargetColumnsSelectionPanel.java
@@ -4,15 +4,17 @@ import java.util.ArrayList;
 
 import org.gcube.portlets.user.td.columnwidget.client.dimension.CodelistSelectionDialog;
 import org.gcube.portlets.user.td.columnwidget.client.dimension.CodelistSelectionListener;
+import org.gcube.portlets.user.td.columnwidget.client.dimension.DimensionRowSelectionDialog;
 import org.gcube.portlets.user.td.columnwidget.client.properties.ColumnDataPropertiesCombo;
 import org.gcube.portlets.user.td.columnwidget.client.properties.ExtractCodelistDefColumnPropertiesCombo;
 import org.gcube.portlets.user.td.columnwidget.client.resources.ResourceBundle;
 import org.gcube.portlets.user.td.columnwidget.client.utils.UtilsGXT3;
 import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
 import org.gcube.portlets.user.td.gwtservice.shared.exception.TDGWTSessionExpiredException;
-import org.gcube.portlets.user.td.gwtservice.shared.extract.ExtractCodelistDefColumn;
+
 import org.gcube.portlets.user.td.gwtservice.shared.extract.ExtractCodelistTargetColumn;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
+import org.gcube.portlets.user.td.gwtservice.shared.tr.DefNewColumn;
 import org.gcube.portlets.user.td.gwtservice.shared.tr.TabResource;
 import org.gcube.portlets.user.td.widgetcommonevent.client.event.SessionExpiredEvent;
 import org.gcube.portlets.user.td.widgetcommonevent.client.type.SessionExpiredType;
@@ -32,7 +34,9 @@ import com.sencha.gxt.widget.core.client.container.SimpleContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer;
 import com.sencha.gxt.widget.core.client.container.VerticalLayoutContainer.VerticalLayoutData;
 import com.sencha.gxt.widget.core.client.event.SelectEvent;
+import com.sencha.gxt.widget.core.client.event.TriggerClickEvent;
 import com.sencha.gxt.widget.core.client.event.SelectEvent.SelectHandler;
+import com.sencha.gxt.widget.core.client.event.TriggerClickEvent.TriggerClickHandler;
 import com.sencha.gxt.widget.core.client.form.ComboBox;
 import com.sencha.gxt.widget.core.client.form.FieldLabel;
 import com.sencha.gxt.widget.core.client.form.TextField;
@@ -195,15 +199,31 @@ public class TargetColumnsSelectionPanel extends FramedPanel implements
 		// comboDefColumn
 		ExtractCodelistDefColumnPropertiesCombo props = GWT
 				.create(ExtractCodelistDefColumnPropertiesCombo.class);
-		ListStore<ExtractCodelistDefColumn> storeComboDefColumn = new ListStore<ExtractCodelistDefColumn>(
+		ListStore<DefNewColumn> storeComboDefColumn = new ListStore<DefNewColumn>(
 				props.id());
-		
+		 
 
-		final ComboBox<ExtractCodelistDefColumn> comboDefColumn = new ComboBox<ExtractCodelistDefColumn>(
+		final ComboBox<DefNewColumn> comboDefColumn = new ComboBox<DefNewColumn>(
 				storeComboDefColumn, props.label());
-
 		Log.debug("ComboDefColumn created");
+		
+		comboDefColumn.addTriggerClickHandler(new TriggerClickHandler() {
 
+			@Override
+			public void onTriggerClick(TriggerClickEvent event) {
+				Log.debug("ComboDefColumn TriggerClickEvent");
+				comboDefColumn.collapse();
+
+				/*DimensionRowSelectionDialog dialogDimensionRowSelection = new DimensionRowSelectionDialog(
+						col, cellData, eventBus);
+				dialogDimensionRowSelection.addListener(listener);
+				dialogDimensionRowSelection.show();*/
+
+			}
+
+		});
+		
+		
 		comboDefColumn.setEmptyText("Select a Column...");
 		comboDefColumn.setWidth(COMBOWIDTH);
 		comboDefColumn.setEditable(false);