fix some on properties and signal connection

src/Vtk/Math/vtkVoxImage.h

@@ -65,7 +65,8 @@ public:
   void setShadingPreset(int blendType = 2);
   void SetRepresentation(Representation mode);
 
-  void Update();
+  void Update() override;
+  void serialize_display(uLib::Archive::display_properties_archive & ar, const unsigned int version = 0) override;
 
 protected:
   void InstallPipe();
@@ -84,6 +85,7 @@ private:
 
   float m_Window;
   float m_Level;
+  int m_ShadingPreset;
 };
 
 } // namespace Vtk