diff --git a/include/osgUtil/RenderBin b/include/osgUtil/RenderBin
index 82f92b1e0..267bd9c50 100644
--- a/include/osgUtil/RenderBin
+++ b/include/osgUtil/RenderBin
@@ -47,7 +47,7 @@ class OSGUTIL_EXPORT RenderBin : public osg::Object
 
         void sort();
 
-        virtual void sort_local() {}
+        virtual void sort_local();
 
         virtual void draw(osg::State& state,RenderLeaf*& previous);
 
diff --git a/src/osgUtil/RenderBin.cpp b/src/osgUtil/RenderBin.cpp
index 26c5a76b3..acd487196 100644
--- a/src/osgUtil/RenderBin.cpp
+++ b/src/osgUtil/RenderBin.cpp
@@ -1,6 +1,8 @@
 #include <osgUtil/RenderBin>
 #include <osgUtil/RenderStage>
 
+#include <algorithm>
+
 using namespace osg;
 using namespace osgUtil;
 
@@ -71,6 +73,23 @@ void RenderBin::sort()
     sort_local();
 }
 
+
+struct StateSortFunctor
+{
+    const bool operator() (const RenderGraph* lhs,const RenderGraph* rhs)
+    {
+        return (*(lhs->_stateset)<*(rhs->_stateset));
+    }
+};
+
+
+
+void RenderBin::sort_local()
+{
+    // now sort the list into acending depth order.
+//    std::sort(_renderGraphList.begin(),_renderGraphList.end(),StateSortFunctor());
+}
+
 RenderBin* RenderBin::find_or_insert(int binNum,const std::string& binName)
 {
     // search for appropriate bin.