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 b698b3b..a6659f1 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
@@ -21,8 +21,6 @@ import com.google.gwt.core.client.Scheduler;
 import com.google.gwt.core.client.Scheduler.ScheduledCommand;
 import com.google.gwt.event.logical.shared.SelectionEvent;
 import com.google.gwt.event.logical.shared.SelectionHandler;
-import com.google.gwt.event.logical.shared.ValueChangeEvent;
-import com.google.gwt.event.logical.shared.ValueChangeHandler;
 import com.google.gwt.user.client.rpc.AsyncCallback;
 import com.google.web.bindery.event.shared.EventBus;
 import com.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
@@ -62,8 +60,8 @@ public class ChangeColumnTypePanel extends FramedPanel {
 	protected FieldLabel comboMeasureTypeLabel;
 	protected ComboBox<ColumnDataTypeElement> comboAttributeType = null;
 	protected FieldLabel comboAttributeTypeLabel;
-
 	protected TextField labelColumn;
+	protected ListLoader<ListLoadConfig, ListLoadResult<ColumnData>> loader;
 
 	public ChangeColumnTypePanel(TRId trId, String columnName, EventBus eventBus) {
 		setWidth(WIDTH);
@@ -74,6 +72,7 @@ public class ChangeColumnTypePanel extends FramedPanel {
 		this.columnName = columnName;
 		this.eventBus = eventBus;
 
+		//Column Data
 		ColumnDataProperties propsColumnData = GWT
 				.create(ColumnDataProperties.class);
 		ListStore<ColumnData> storeCombo = new ListStore<ColumnData>(
@@ -88,9 +87,10 @@ public class ChangeColumnTypePanel extends FramedPanel {
 				loadData(loadConfig, callback);
 			}
 		};
-		final ListLoader<ListLoadConfig, ListLoadResult<ColumnData>> loader = new ListLoader<ListLoadConfig, ListLoadResult<ColumnData>>(
+		
+		loader = new ListLoader<ListLoadConfig, ListLoadResult<ColumnData>>(
 				proxy);
-		loader.setRemoteSort(false);
+		//loader.setRemoteSort(false);
 		loader.addLoadHandler(new LoadResultListStoreBinding<ListLoadConfig, ColumnData, ListLoadResult<ColumnData>>(
 				storeCombo));
 		Log.trace("LoaderCombo created");
@@ -109,12 +109,14 @@ public class ChangeColumnTypePanel extends FramedPanel {
 		};
 		Log.trace("Combo ColumnData created");
 
-		addHandlersForEventObservation(comboColumn, propsColumnData.label());
+		//addHandlersForEventObservation(comboColumn, propsColumnData.label());
+		addHandlersForComboColumn(propsColumnData.label());
+		
 		comboColumn.setLoader(loader);
 		comboColumn.setEmptyText("Select a column...");
 		comboColumn.setWidth(150);
-		comboColumn.setTypeAhead(true);
-		comboColumn.setEditable(true);
+		comboColumn.setTypeAhead(false);
+		comboColumn.setEditable(false);
 		comboColumn.setTriggerAction(TriggerAction.ALL);
 		
 
@@ -191,35 +193,38 @@ public class ChangeColumnTypePanel extends FramedPanel {
 		v.add(comboAttributeTypeLabel, new VerticalLayoutData(1, -1));
 
 		add(v, new VerticalLayoutData(-1, -1, new Margins()));
-		addButton(new TextButton("Change"));
+		add(new TextButton("Change"), new VerticalLayoutData(-1, -1, new Margins(10,0,10,0)));
+		
+		//addButton();
 	}
 
-	private <T> void addHandlersForEventObservation(ComboBox<T> combo,
-			final LabelProvider<T> labelProvider) {
-		combo.addValueChangeHandler(new ValueChangeHandler<T>() {
+	
+	
+	
+	protected void addHandlersForComboColumn(
+			final LabelProvider<ColumnData>  labelProvider) {
+		comboColumn
+				.addSelectionHandler(new SelectionHandler<ColumnData>() {
+					public void onSelection(
+							SelectionEvent<ColumnData> event) {
+						Info.display(
+								"Column Type Selected",
+								"You selected "
+										+ (event.getSelectedItem() == null ? "nothing"
+												: labelProvider.getLabel(event
+														.getSelectedItem())
+														+ "!"));
+						Log.debug("ComboColumn selected: "
+								+ event.getSelectedItem());
+						ColumnData columnType = event
+								.getSelectedItem();
+						//updateColumnType(columnType.getCode());
+					}
 
-			public void onValueChange(ValueChangeEvent<T> event) {
-				Info.display(
-						"Value Changed",
-						"New value: "
-								+ (event.getValue() == null ? "nothing"
-										: labelProvider.getLabel(event
-												.getValue()) + "!"));
-
-			}
-		});
-		combo.addSelectionHandler(new SelectionHandler<T>() {
-			public void onSelection(SelectionEvent<T> event) {
-				Info.display(
-						"State Selected",
-						"You selected "
-								+ (event.getSelectedItem() == null ? "nothing"
-										: labelProvider.getLabel(event
-												.getSelectedItem()) + "!"));
-			}
-		});
+				});
 	}
-
+	
+	
 	protected void addHandlersForComboColumnTypeCode(
 			final LabelProvider<ColumnTypeCodeElement> labelProvider) {
 		comboColumnTypeCode
@@ -227,7 +232,7 @@ public class ChangeColumnTypePanel extends FramedPanel {
 					public void onSelection(
 							SelectionEvent<ColumnTypeCodeElement> event) {
 						Info.display(
-								"Type Selected",
+								"Column Type Selected",
 								"You selected "
 										+ (event.getSelectedItem() == null ? "nothing"
 												: labelProvider.getLabel(event
@@ -250,7 +255,7 @@ public class ChangeColumnTypePanel extends FramedPanel {
 					public void onSelection(
 							SelectionEvent<ColumnDataTypeElement> event) {
 						Info.display(
-								"Type Selected",
+								"Measure Type Selected",
 								"You selected "
 										+ (event.getSelectedItem() == null ? "nothing"
 												: labelProvider.getLabel(event
@@ -273,13 +278,13 @@ public class ChangeColumnTypePanel extends FramedPanel {
 					public void onSelection(
 							SelectionEvent<ColumnDataTypeElement> event) {
 						Info.display(
-								"Type Selected",
+								"Attribute Type Selected",
 								"You selected "
 										+ (event.getSelectedItem() == null ? "nothing"
 												: labelProvider.getLabel(event
 														.getSelectedItem())
 														+ "!"));
-						Log.debug("ComboMeasureType selected: "
+						Log.debug("ComboAttributeType selected: "
 								+ event.getSelectedItem());
 						ColumnDataTypeElement attributeType = event
 								.getSelectedItem();
@@ -290,6 +295,7 @@ public class ChangeColumnTypePanel extends FramedPanel {
 	}
 
 	protected void updateColumnType(ColumnTypeCode type) {
+		Log.debug("Update ColumnTyepeCod"+type.toString());
 		if (type == ColumnTypeCode.MEASURE) {
 			comboMeasureTypeLabel.setVisible(true);
 			comboAttributeTypeLabel.setVisible(false);
@@ -316,10 +322,6 @@ public class ChangeColumnTypePanel extends FramedPanel {
 	
 	protected void loadData(ListLoadConfig loadConfig,
 			final AsyncCallback<ListLoadResult<ColumnData>> callback) {
-		
-		
-		
-		
 		TDGWTServiceAsync.INSTANCE.getColumns(trId,
 				new AsyncCallback<ArrayList<ColumnData>>() {
 
diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/store/ColumnTypeCodeStore.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/store/ColumnTypeCodeStore.java
index a911af7..53751f1 100644
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/store/ColumnTypeCodeStore.java
+++ b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/store/ColumnTypeCodeStore.java
@@ -18,9 +18,10 @@ public class ColumnTypeCodeStore implements Serializable {
 
 	private static final long serialVersionUID = -1908324094430432681L;
 
-	protected static ArrayList<ColumnTypeCodeElement> store = new ArrayList<ColumnTypeCodeElement>();
-
+	protected static ArrayList<ColumnTypeCodeElement> store;
+	
 	public static ArrayList<ColumnTypeCodeElement> getColumnTypeCodes(){
+		store = new ArrayList<ColumnTypeCodeElement>();
 		store.add(new ColumnTypeCodeElement(1,ColumnTypeCode.ANNOTATION));
 		store.add(new ColumnTypeCodeElement(2,ColumnTypeCode.ATTRIBUTE));
 		store.add(new ColumnTypeCodeElement(3,ColumnTypeCode.MEASURE));