fixes in highlight code

src/Mod/Assembly/App/Item.cpp

@@ -28,6 +28,7 @@
 #include <Base/Placement.h>
 
 #include "Item.h"
+#include "ItemPy.h"
 
 
 using namespace Assembly;
@@ -62,4 +63,13 @@ App::DocumentObjectExecReturn *Item::execute(void)
     return App::DocumentObject::StdReturn;
 }
 
+PyObject *Item::getPyObject(void)
+{
+    if (PythonObject.is(Py::_None())){
+        // ref counter is set to 1
+        PythonObject = Py::Object(new ItemPy(this),true);
+    }
+    return Py::new_reference_to(PythonObject); 
+}
+
 }