diff --git a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentWellMaterialBrowserGrid.java b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentWellMaterialBrowserGrid.java
index 9d2f4053d6019a641208bb66dca40780fae9a86d..dd0f1314bda3ad2c08eb50d0a869f6331a95128e 100644
--- a/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentWellMaterialBrowserGrid.java
+++ b/screening/source/java/ch/systemsx/cisd/openbis/plugin/screening/client/web/client/application/detailviewers/ExperimentWellMaterialBrowserGrid.java
@@ -47,7 +47,7 @@ public class ExperimentWellMaterialBrowserGrid extends MaterialBrowserGrid
             final IEntityInformationHolderWithIdentifier experiment)
     {
         final MaterialBrowserToolbar toolbar =
-                new MaterialBrowserToolbar(screeningViewContext.getCommonViewContext(),
+                new MaterialBrowserToolbar(screeningViewContext.getCommonViewContext(), null,
                         "experiment-well-material-browser-toolbar");
         final ICriteriaProvider<ListMaterialDisplayCriteria> criteriaProvider = toolbar;
         final ExperimentWellMaterialBrowserGrid browserGrid =