Second try to fix mockito exception on the build server
diff --git a/tests/org.eclipse.rap.nebula.widgets.grid.test/src/org/eclipse/nebula/widgets/grid/internal/griditemkit/GridItemLCA_Test.java b/tests/org.eclipse.rap.nebula.widgets.grid.test/src/org/eclipse/nebula/widgets/grid/internal/griditemkit/GridItemLCA_Test.java
index f7f7161..14c3f77 100644
--- a/tests/org.eclipse.rap.nebula.widgets.grid.test/src/org/eclipse/nebula/widgets/grid/internal/griditemkit/GridItemLCA_Test.java
+++ b/tests/org.eclipse.rap.nebula.widgets.grid.test/src/org/eclipse/nebula/widgets/grid/internal/griditemkit/GridItemLCA_Test.java
@@ -671,7 +671,7 @@
 
   // [if] Workaround for mockito exception on the build server:
   // "Mockito cannot mock this class: interface org.eclipse.swt.events.TreeListener"
-  private class TestTreeListener implements TreeListener {
+  public static class TestTreeListener implements TreeListener {
     public void treeCollapsed( TreeEvent event ) {
     }
     public void treeExpanded( TreeEvent event ) {