diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewer.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewer.java
index 300e2ed..d6c11a7 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewer.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/GeoportalDataViewer.java
@@ -1,16 +1,16 @@
 package org.gcube.portlets.user.geoportaldataviewer.client;
 
+import org.gcube.portlets.user.geoportaldataviewer.client.gis.OsmExample;
 import org.gcube.portlets.user.geoportaldataviewer.client.ui.GeonaDataViewMainPanel;
 
 import com.google.gwt.core.client.EntryPoint;
 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.dom.client.Style.Unit;
-import com.google.gwt.user.client.ui.HTMLPanel;
+import com.google.gwt.event.logical.shared.ResizeEvent;
+import com.google.gwt.event.logical.shared.ResizeHandler;
+import com.google.gwt.user.client.Window;
 import com.google.gwt.user.client.ui.RootPanel;
-import com.google.gwt.user.client.ui.SimplePanel;
-import com.google.gwt.user.client.ui.TabLayoutPanel;
 
 /**
  * Entry point classes define <code>onModuleLoad()</code>.
@@ -34,6 +34,10 @@ public class GeoportalDataViewer implements EntryPoint {
   public final static String APP_DIV = "geoportal-data-viewer";
 
   private boolean initialized = false;
+  
+  private OsmExample osmExample = null;
+  
+  private GeonaDataViewMainPanel mainPanel;
   /**
    * This is the entry point method.
    */
@@ -44,7 +48,7 @@ public class GeoportalDataViewer implements EntryPoint {
 //	htmlPanel.setHeight("500px");
 //	htmlPanel.getElement().setId("map");
 //	
-	GeonaDataViewMainPanel mainPanel = new GeonaDataViewMainPanel();
+	mainPanel = new GeonaDataViewMainPanel();
 	
 	RootPanel.get(APP_DIV).add(mainPanel);
 	
@@ -52,29 +56,20 @@ public class GeoportalDataViewer implements EntryPoint {
 		
 		@Override
 		public void execute() {
-			new OsmExample(mainPanel.getMapPanel().getElement().getId());
+			osmExample = new OsmExample(mainPanel.getMapPanel().getElement().getId());
 			//new OsmExample(htmlPanel.getElement().getId());
 			
 		}
 	});
 	
-//	SimplePanel sp = new SimplePanel() {
-//		
-//		@Override 
-//		public void setVisible(boolean visible) {
-//            if (visible && !initialized) {
-//                Scheduler.get().scheduleDeferred(() -> example.getExample().show(example.getExample().toString()));
-//                initialized = true;
-//            }
-//            super.setVisible(visible);
-//
-//            if (visible) {
-//                History.newItem(example.name());
-//            }
-//        }
-//	};
-
-	
-	
+	Window.addResizeHandler(new ResizeHandler() {
+		@Override
+		public void onResize(ResizeEvent event) {
+			GWT.log("onWindowResized width: "+event.getWidth()+" height: "+event.getHeight());
+			mainPanel.setHeight(event.getHeight()-200);
+		}
+	});
   }
+  
+
 }
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/DemoUtils.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/DemoUtils.java
similarity index 97%
rename from src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/DemoUtils.java
rename to src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/DemoUtils.java
index ddc85c6..7f04fda 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/DemoUtils.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/DemoUtils.java
@@ -1,4 +1,6 @@
-package org.gcube.portlets.user.geoportaldataviewer.client;
+package org.gcube.portlets.user.geoportaldataviewer.client.gis;
+
+import org.gcube.portlets.user.geoportaldataviewer.client.GeoportalDataViewerConstants;
 
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.LinkElement;
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/OsmExample.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OsmExample.java
similarity index 95%
rename from src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/OsmExample.java
rename to src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OsmExample.java
index 6f35055..f602b26 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/OsmExample.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OsmExample.java
@@ -1,6 +1,9 @@
-package org.gcube.portlets.user.geoportaldataviewer.client;
+package org.gcube.portlets.user.geoportaldataviewer.client.gis;
+
+import org.gcube.portlets.user.geoportaldataviewer.client.GeoportalDataViewerConstants;
 
 import ol.Coordinate;
+import ol.Extent;
 import ol.Map;
 import ol.MapOptions;
 import ol.OLFactory;
@@ -69,16 +72,19 @@ public class OsmExample {
 
 		Projection projection = new Projection(projectionOptions);
 		viewOptions.setProjection(projection);
+		viewOptions.setMaxZoom(19);
+		//viewOptions.setExtent(new Extent(-180, -90, 180, 90));
 
         // create a view
         view = new View(viewOptions);
 
-        Coordinate centerCoordinate = OLFactory.createCoordinate(-0.1275, 51.507222);
+        //EPSG_4326_TO_ITALY
+        Coordinate centerCoordinate = OLFactory.createCoordinate(12.45, 42.98);
         Coordinate transformedCenterCoordinate = Projection.transform(centerCoordinate, GeoportalDataViewerConstants.EPSG_4326, GeoportalDataViewerConstants.EPSG_3857);
 
-        Coordinate coordinate = new Coordinate(16, 48);
-        view.setCenter(coordinate);
-        view.setZoom(10);
+        view.setCenter(transformedCenterCoordinate);
+        view.setZoom(5);
+        
 
         // create the map
         MapOptions mapOptions = OLFactory.createOptions();
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/GeonaDataViewMainPanel.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/GeonaDataViewMainPanel.java
index 5cdf8cb..22264ec 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/GeonaDataViewMainPanel.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/GeonaDataViewMainPanel.java
@@ -27,6 +27,10 @@ public class GeonaDataViewMainPanel extends Composite {
 		htmlPanel.setHeight("600px");
 		mapPanel.add(htmlPanel);
 	}
+	
+	public void setHeight(int height) {
+		htmlPanel.setHeight(height +"px");
+	}
 
 	public HTMLPanel getMapPanel() {
 		return htmlPanel;