diff --git a/src/main/java/org/gcube/portlets/user/td/client/PortalViewport.java b/src/main/java/org/gcube/portlets/user/td/client/PortalViewport.java
new file mode 100644
index 0000000..5bcc2cb
--- /dev/null
+++ b/src/main/java/org/gcube/portlets/user/td/client/PortalViewport.java
@@ -0,0 +1,118 @@
+/**
+ * 
+ */
+package org.gcube.portlets.user.td.client;
+
+import com.allen_sauer.gwt.log.client.Log;
+import com.google.gwt.core.client.GWT;
+import com.google.gwt.safehtml.shared.SafeHtmlBuilder;
+import com.google.gwt.user.client.Window;
+import com.sencha.gxt.core.client.dom.XDOM;
+import com.sencha.gxt.widget.core.client.container.SimpleContainer;
+import com.sencha.gxt.widget.core.client.container.Viewport.ViewportAppearance;
+
+/**
+ * @author "Federico De Faveri defaveri@isti.cnr.it"
+ *
+ */
+public class PortalViewport extends SimpleContainer {
+
+	protected int rightScrollBarSize = 17;
+
+	protected boolean enableScroll;
+
+	/**
+	 * Creates a viewport layout container with the default appearance.
+	 */
+	public PortalViewport() {
+		this(GWT.<ViewportAppearance> create(ViewportAppearance.class));
+	}
+
+	/**
+	 * Creates a viewport layout container with the specified appearance.
+	 * 
+	 * @param appearance the appearance of the viewport layout container
+	 */
+	public PortalViewport(ViewportAppearance appearance) {
+		super(true);
+		SafeHtmlBuilder sb = new SafeHtmlBuilder();
+		appearance.render(sb);
+		setElement(XDOM.create(sb.toSafeHtml()));
+		monitorWindowResize = true;
+		getFocusSupport().setIgnore(false);
+		resize();
+	}
+
+	/**
+	 * Returns true if window scrolling is enabled.
+	 * 
+	 * @return true if window scrolling is enabled
+	 */
+	public boolean getEnableScroll() {
+		return enableScroll;
+	}
+
+	/**
+	 * Sets whether window scrolling is enabled.
+	 * 
+	 * @param enableScroll true to enable window scrolling
+	 */
+	public void setEnableScroll(boolean enableScroll) {
+		this.enableScroll = enableScroll;
+		Window.enableScrolling(enableScroll);
+	}
+
+	/**
+	 * @return the rightScrollBarSize
+	 */
+	public int getRightScrollBarSize() {
+		return rightScrollBarSize;
+	}
+
+	/**
+	 * @param rightScrollBarSize the rightScrollBarSize to set
+	 */
+	public void setRightScrollBarSize(int rightScrollBarSize) {
+		this.rightScrollBarSize = rightScrollBarSize;
+	}
+
+	@Override
+	protected void onAttach() {
+		setEnableScroll(enableScroll);
+		resize();
+		super.onAttach();
+	}
+
+	protected void resize()
+	{
+		int viewWidth = calculateWidth() - rightScrollBarSize;
+		int viewHeight = calculateHeight();
+		Log.trace("resize viewWidth: "+viewWidth+" viewHeight: "+viewHeight+" clientWidth: "+Window.getClientWidth()+" clientHeight: "+Window.getClientHeight());
+		setPixelSize(viewWidth, viewHeight);
+	}
+
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	protected void onWindowResize(int width, int height) {
+		int viewWidth = calculateWidth();
+		int viewHeight = calculateHeight();
+		Log.trace("onWindowResize viewWidth: "+viewWidth+" viewHeight: "+viewHeight+" clientWidth: "+Window.getClientWidth()+" clientHeight: "+Window.getClientHeight());
+		setPixelSize(viewWidth, viewHeight);
+	}
+
+	protected int calculateWidth()
+	{
+		int leftBorder = getAbsoluteLeft();
+		return Window.getClientWidth() - 2 * leftBorder;
+	}
+
+	protected int calculateHeight()
+	{
+		int topBorder = getAbsoluteTop();
+		return Window.getClientHeight() - topBorder - 34;
+	}
+
+}