diff --git a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeToAnnotationColumnDialog.java b/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeToAnnotationColumnDialog.java
deleted file mode 100644
index 9c736de..0000000
--- a/src/main/java/org/gcube/portlets/user/td/columnwidget/client/ChangeToAnnotationColumnDialog.java
+++ /dev/null
@@ -1,179 +0,0 @@
-package org.gcube.portlets.user.td.columnwidget.client;
-
-import java.util.ArrayList;
-
-import org.gcube.portlets.user.td.columnwidget.client.properties.ColumnDataProperties;
-import org.gcube.portlets.user.td.gwtservice.client.rpc.TDGWTServiceAsync;
-import org.gcube.portlets.user.td.gwtservice.shared.tr.ColumnData;
-import org.gcube.portlets.user.td.widgetcommonevent.shared.TRId;
-
-import com.allen_sauer.gwt.log.client.Log;
-import com.google.gwt.core.client.GWT;
-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.sencha.gxt.cell.core.client.form.ComboBoxCell.TriggerAction;
-import com.sencha.gxt.data.client.loader.RpcProxy;
-import com.sencha.gxt.data.shared.LabelProvider;
-import com.sencha.gxt.data.shared.ListStore;
-import com.sencha.gxt.data.shared.loader.ListLoadConfig;
-import com.sencha.gxt.data.shared.loader.ListLoadResult;
-import com.sencha.gxt.data.shared.loader.ListLoadResultBean;
-import com.sencha.gxt.data.shared.loader.ListLoader;
-import com.sencha.gxt.data.shared.loader.LoadResultListStoreBinding;
-import com.sencha.gxt.widget.core.client.FramedPanel;
-import com.sencha.gxt.widget.core.client.Window;
-import com.sencha.gxt.widget.core.client.button.TextButton;
-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.form.ComboBox;
-import com.sencha.gxt.widget.core.client.form.FieldLabel;
-import com.sencha.gxt.widget.core.client.info.Info;
-
-/**
- * 
- * 
- * @author "Giancarlo Panichi" 
- * <a href="mailto:g.panichi@isti.cnr.it">g.panichi@isti.cnr.it</a> 
- *
- */
-public class ChangeToAnnotationColumnDialog extends Window {
-	protected int WIDTH=400;
-	protected int HEIGHT=120;
-	protected TRId trId;
-	protected ComboBox<ColumnData> combo=null;
-	protected String columnName=null;
-	
-	public ChangeToAnnotationColumnDialog(TRId trId) {
-		create(trId, null);
-	}
-
-	public ChangeToAnnotationColumnDialog(TRId trId, String columnName) {
-		create(trId, columnName);
-	}
-
-	protected void create(TRId trId, String columnName) {
-		this.trId=trId;
-		this.columnName=columnName;
-		setBodyBorder(false);
-		// getHeader().setIcon(Resources.IMAGES.side_list());
-		setHeadingText("Change To Annotation Column");
-		setWidth(WIDTH);
-		setHeight(HEIGHT);
-		setResizable(false);
-		
-		FramedPanel panel=new FramedPanel();
-		panel.setHeaderVisible(false);
-		panel.setBodyBorder(false);
-		
-		VerticalLayoutContainer v = new VerticalLayoutContainer();
-		 
-		ColumnDataProperties props = GWT.create(ColumnDataProperties.class);
-		ListStore<ColumnData> store = new ListStore<ColumnData>(props.id());
-		
-		Log.trace("Store created");
-		RpcProxy<ListLoadConfig, ListLoadResult<ColumnData>> proxy = new RpcProxy<ListLoadConfig,  ListLoadResult<ColumnData>>() {
-			
-			public void load(ListLoadConfig loadConfig, final AsyncCallback<ListLoadResult<ColumnData>> callback) {
-				loadData(loadConfig, callback);
-			}	
-		};
-		final ListLoader<ListLoadConfig, ListLoadResult<ColumnData>> loader = new ListLoader<ListLoadConfig, ListLoadResult<ColumnData>>(proxy);
-		loader.setRemoteSort(false);
-		loader.addLoadHandler(new LoadResultListStoreBinding<ListLoadConfig, ColumnData, ListLoadResult<ColumnData>>(store));
-		Log.trace("Loader created");
-		
-		
-		combo = new ComboBox<ColumnData>(store,
-				props.label()){
-			@Override
-			protected void onAfterFirstAttach() {
-				super.onAfterFirstAttach();
-				Scheduler.get().scheduleDeferred(new ScheduledCommand() {
-					public void execute() {
-						loader.load();
-					}
-				});
-			}
-		};
-		Log.trace("Combo created");
-		
-		addHandlersForEventObservation(combo, props.label());
-
-		combo.setEmptyText("Select a column...");
-		combo.setWidth(150);
-		combo.setTypeAhead(true);
-		combo.setTriggerAction(TriggerAction.ALL);
-		combo.setLoader(loader);
-	   
-	    v.add(new FieldLabel(combo, "Column"), new VerticalLayoutData(1, -1));
-	    
-	    panel.add(v);
-	    panel.addButton(new TextButton("Change"));
-		 
-	    add(panel);
-	    
-	}
-
-	private <T> void addHandlersForEventObservation(ComboBox<T> combo,
-			final LabelProvider<T> labelProvider) {
-		combo.addValueChangeHandler(new ValueChangeHandler<T>() {
-
-			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 loadData(ListLoadConfig loadConfig,
-			final AsyncCallback<ListLoadResult<ColumnData>> callback) {
-		TDGWTServiceAsync.INSTANCE.getColumns(trId, new AsyncCallback<ArrayList<ColumnData>>(){
-
-			public void onFailure(Throwable caught) {
-				Log.error("load combo failure:"+caught.getLocalizedMessage());
-				callback.onFailure(caught);
-			}
-
-			public void onSuccess(ArrayList<ColumnData> result) {
-				Log.trace("loaded " + result.size() + " ColumnData");
-				if(columnName!=null){
-					for(ColumnData cd: result){
-						if(cd.getName().compareTo(columnName)==0){
-							combo.setValue(cd);
-						}
-					}
-				}
-				callback.onSuccess(new ListLoadResultBean<ColumnData>(
-						result));
-				
-			}
-			
-		});
-				
-	}
-
-}