diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/AnalysisProcedureChooser.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/AnalysisProcedureChooser.java
index 782b13b57a0a1dabe24f28b82aecaab5bd46342d..c06040f87b0e3fda3b8183348e60f0fc17e88037 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/AnalysisProcedureChooser.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/AnalysisProcedureChooser.java
@@ -24,10 +24,9 @@ import com.extjs.gxt.ui.client.event.BaseEvent;
 import com.extjs.gxt.ui.client.event.Events;
 import com.extjs.gxt.ui.client.event.Listener;
 import com.extjs.gxt.ui.client.widget.Component;
-import com.extjs.gxt.ui.client.widget.LayoutContainer;
+import com.extjs.gxt.ui.client.widget.HorizontalPanel;
 import com.extjs.gxt.ui.client.widget.form.ComboBox.TriggerAction;
 import com.extjs.gxt.ui.client.widget.form.SimpleComboBox;
-import com.extjs.gxt.ui.client.widget.toolbar.FillToolItem;
 import com.extjs.gxt.ui.client.widget.toolbar.LabelToolItem;
 
 import ch.systemsx.cisd.common.shared.basic.utils.StringUtils;
@@ -41,7 +40,7 @@ import ch.systemsx.cisd.openbis.plugin.screening.client.web.client.application.D
  * 
  * @author Kaloyan Enimanev
  */
-class AnalysisProcedureChooser extends LayoutContainer
+class AnalysisProcedureChooser extends HorizontalPanel
 {
 
     /**
@@ -84,7 +83,6 @@ class AnalysisProcedureChooser extends LayoutContainer
 
         add(createComboLabel());
         add(analysisProceduresComboBox);
-        add(new FillToolItem());
         addAnalysisProcedures(analysisProcedures);
 
 
diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentAnalysisSummarySection.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentAnalysisSummarySection.java
index b8b956c811c882e191cbb9622d1c9cdf13f6a114..720b3be88ac4105518ca2991d77ad6d48831f361 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentAnalysisSummarySection.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentAnalysisSummarySection.java
@@ -76,7 +76,7 @@ public class ExperimentAnalysisSummarySection extends DisposableTabContent
                             getHeader().addTool(analysisProcedureChooser);
                             // WORKAROUND to GXT private widgetPanel in Header with fixed
                             // "float: right" set onRender
-                            analysisProcedureChooser.addStyleName("force-float-left");
+                            analysisProcedureChooser.getParent().addStyleName("force-float-left");
 
                             replaceContent(analysisGridDisposableComponent);
                         }