diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/CommonColumns.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/CommonColumns.java
index 00fe612d7ceec3f621aa4427914ebc0e28cbcf2c..07900beaee8082e775bdc0902f3b96ded53b7124 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/CommonColumns.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/CommonColumns.java
@@ -65,6 +65,7 @@ class CommonColumns
         columnConfig.setId(SampleModel.SAMPLE_CODE);
         columnConfig.setHeader("Code");
         columnConfig.setWidth(100);
+        columnConfig.setRenderer(new SampleRenderer());
         return columnConfig;
     }
 
@@ -119,5 +120,4 @@ class CommonColumns
         columnConfig.setHidden(true);
         return columnConfig;
     }
-
 }
\ No newline at end of file
diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/SampleRenderer.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/SampleRenderer.java
new file mode 100644
index 0000000000000000000000000000000000000000..1fc465bc18eab10631b75a50529077798cd9d911
--- /dev/null
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/sample_browser/SampleRenderer.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2008 ETH Zuerich, CISD
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package ch.systemsx.cisd.openbis.generic.client.web.client.application.ui.sample_browser;
+
+import com.extjs.gxt.ui.client.data.ModelData;
+import com.extjs.gxt.ui.client.store.ListStore;
+import com.extjs.gxt.ui.client.widget.grid.ColumnData;
+import com.extjs.gxt.ui.client.widget.grid.GridCellRenderer;
+import com.google.gwt.user.client.DOM;
+import com.google.gwt.user.client.Element;
+
+/**
+ * Renders sample code and marks if the sample is invalid
+ * 
+ * @author Tomasz Pylak
+ */
+public class SampleRenderer implements GridCellRenderer<ModelData>
+{
+
+    public String render(ModelData model, String property, ColumnData config, int rowIndex,
+            int colIndex, ListStore<ModelData> store)
+    {
+        String code = (String) model.get(SampleModel.SAMPLE_CODE);
+        boolean isInvalid = (Boolean) model.get(SampleModel.IS_INVALID);
+        if (isInvalid)
+        {
+            Element div = DOM.createDiv();
+            div.setAttribute("class", "invalidated-sample");
+            div.setInnerText(code);
+            return DOM.toString(div);
+        } else
+        {
+            return code;
+        }
+    }
+
+}