Change the color of some points in selected point cloud

Hello,
I have rendered a Point cloud succesfully by subclassing AIS_InteractiveObject.

thanks to the guidance in this thread : http://www.opencascade.org/org/forum/thread_1125/

So my compute function is like this:

void AIS_PointCloud::Compute(const Handle(PrsMgr_PresentationManager3d)& aPresentationManager,
                             const Handle(Prs3d_Presentation)& aPresentation,
                             const Standard_Integer aMode)

{

Handle(Graphic3d_Structure) theStructure = Handle(Graphic3d_Structure)::DownCast(aPresentation);

Handle(Graphic3d_Group) theGroup=  theStructure->NewGroup();

Handle(Graphic3d_AspectMarker3d) asp;
asp = myDrawer->PointAspect()->Aspect();

asp->SetType(Aspect_TOM_POINT);

theGroup->SetGroupPrimitivesAspect(asp);

const Graphic3d_ArrayOfPoints& theArray= new Graphic3d_ArrayOfPoints(vertlist.size(),Standard_True); //vertlist is list of your points with colors.

 lit  = vertlist.begin();
 lend = vertlist.end();

for(;lit!=lend;++lit){
{            

theArray->AddVertex(lit->pnt, lit->color); //add every point with it color

}

theGroup->AddPrimitiveArray(theArray);

}

When I select this point cloud object,  the point colors changes to the default selection color which is Quantity_NOC_GRAY80. I would like that color points remain unchanged after selection knowing that it is work with OCC 6.7.1
But after migration to OCC 6.8, it didn't work.
 
Please help me.