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 3fb7fe2..0ea872f 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
@@ -363,13 +363,18 @@ public class GeoportalDataViewer implements EntryPoint {
 		applicationBus.addHandler(DoActionOnDetailLayersEvent.TYPE, new DoActionOnDetailLayersEventHandler() {
 
 			@Override
-			public void onDoActionOnDetailLayers(DoActionOnDetailLayersEvent doActionOnDetailLayersEvent) {
+			public void onDoActionOnDetailLayers(DoActionOnDetailLayersEvent doLayerActionEvent) {
 
-				DO_LAYER_ACTION doAction = doActionOnDetailLayersEvent.getDoAction();
+				DO_LAYER_ACTION doAction = doLayerActionEvent.getDoAction();
+				GWT.log("event: "+doAction);
+				GWT.log("layer source: "+doLayerActionEvent.getLayerSource().getName());
+				GWT.log("layer target: "+doLayerActionEvent.getLayerTarget());
+				
 				switch (doAction) {
 				case OPACITY:
-					olMapMng.getOLOSMMap().setWMSDetailLayerOpacity(doActionOnDetailLayersEvent.getLayerSource(),
-							doActionOnDetailLayersEvent.getOpacity());
+					GWT.log("opacity: "+doLayerActionEvent.getOpacity());
+					olMapMng.getOLOSMMap().setWMSDetailLayerOpacity(doLayerActionEvent.getLayerSource(),
+							doLayerActionEvent.getOpacity());
 					break;
 
 				case SWAP:
@@ -377,8 +382,9 @@ public class GeoportalDataViewer implements EntryPoint {
 					break;
 
 				case VISIBILITY:
-					olMapMng.getOLOSMMap().setWMSDetailLayerVisible(doActionOnDetailLayersEvent.getLayerSource(),
-							doActionOnDetailLayersEvent.getVisibility());
+					GWT.log("visibility: "+doLayerActionEvent.getVisibility());
+					olMapMng.getOLOSMMap().setWMSDetailLayerVisible(doLayerActionEvent.getLayerSource(),
+							doLayerActionEvent.getVisibility());
 					break;
 
 				default:
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/events/DoActionOnDetailLayersEvent.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/events/DoActionOnDetailLayersEvent.java
index ff8aa21..b74e257 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/events/DoActionOnDetailLayersEvent.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/events/DoActionOnDetailLayersEvent.java
@@ -93,4 +93,23 @@ public class DoActionOnDetailLayersEvent extends GwtEvent<DoActionOnDetailLayers
 		return visibility;
 	}
 
+	@Override
+	public String toString() {
+		StringBuilder builder = new StringBuilder();
+		builder.append("DoActionOnDetailLayersEvent [doAction=");
+		builder.append(doAction);
+		builder.append(", layerSource=");
+		builder.append(layerSource);
+		builder.append(", layerTarget=");
+		builder.append(layerTarget);
+		builder.append(", opacity=");
+		builder.append(opacity);
+		builder.append(", visibility=");
+		builder.append(visibility);
+		builder.append("]");
+		return builder.toString();
+	}
+	
+	
+
 }
\ No newline at end of file
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OpenLayerOSM.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OpenLayerOSM.java
index 83412f2..67c45f7 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OpenLayerOSM.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/gis/OpenLayerOSM.java
@@ -422,7 +422,7 @@ public abstract class OpenLayerOSM {
 			Image wmsLayer = new Image(layerOptions);
 			map.addLayer(wmsLayer);
 			wmsDetailsLayerMap.put(key, wmsLayer);
-
+			
 			GWT.log("Added WMSDetailLayer for layer name: " + layerItem.getName());
 			eventBus.fireEvent(new AddedLayerToMapEvent(layerItem, LAYER_TYPE.OVERLAY));
 		} else {
@@ -774,6 +774,7 @@ public abstract class OpenLayerOSM {
 
 	public void setWMSDetailLayerVisible(LayerItem layerItem, boolean visible) {
 		String key = layerItem.getName();
+		GWT.log("current layers: "+wmsDetailsLayerMap.keySet());
 		Image layer = wmsDetailsLayerMap.get(key);
 		layer.setVisible(visible);
 	}
diff --git a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/dandd/RangeSlider.java b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/dandd/RangeSlider.java
index 7e1c70d..ed5a97e 100644
--- a/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/dandd/RangeSlider.java
+++ b/src/main/java/org/gcube/portlets/user/geoportaldataviewer/client/ui/dandd/RangeSlider.java
@@ -2,8 +2,13 @@ package org.gcube.portlets.user.geoportaldataviewer.client.ui.dandd;
 
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.dom.client.Element;
+import com.google.gwt.event.dom.client.DragStartEvent;
+import com.google.gwt.event.dom.client.DragStartHandler;
 import com.google.gwt.uibinder.client.UiBinder;
 import com.google.gwt.uibinder.client.UiField;
+import com.google.gwt.user.client.Event;
+import com.google.gwt.user.client.EventListener;
+import com.google.gwt.user.client.Random;
 import com.google.gwt.user.client.ui.Composite;
 import com.google.gwt.user.client.ui.Widget;
 
@@ -13,18 +18,33 @@ public class RangeSlider extends Composite {
 
 	interface RangeSliderUiBinder extends UiBinder<Widget, RangeSlider> {
 	}
+	
+	@UiField
+	Element theSlider;
+	
+	private String sliderId;
 
 	public RangeSlider() {
 		initWidget(uiBinder.createAndBindUi(this));
-	}
-
-	@UiField
-	Element theSlider;
-
-	public RangeSlider(String firstName) {
-		initWidget(uiBinder.createAndBindUi(this));
-		
+		String sliderId = "slider-" +Random.nextInt();
 		theSlider.addClassName("slider");
+		theSlider.setId(sliderId);
+		
+		Event.sinkEvents(theSlider, Event.ONMOUSEUP);
+	    Event.setEventListener(theSlider, new EventListener() {
 
+	        @Override
+	        public void onBrowserEvent(Event event) {
+	            System.out.println("ok");
+	             if(Event.ONMOUSEUP == event.getTypeInt()) {
+	                 GWT.log("Event.ONMOUSEUP");
+	                GWT.log("obj"+theSlider.getPropertyObject("value"));
+	                GWT.log("attr"+theSlider.getAttribute("value"));
+	             }
+
+	        }
+	    });
+		
 	}
+	
 }