Highlighting an array of colored segments

Hello! I have an array of Graphic3d_ArrayOfPrimitives which contains segments colored with different colors. When highlighting it (using HilightSelected() and HilightOwnerWithColor()), I want to modify only the segment width of each element inside the array, but the colors to remain the same. Which is the best approach? I tried various tests but with no success, I can only modify the complete array color, and no success with modifying the width. This is a test sample:

// init drawers attributes
Handle(Prs3d_ShadingAspect) shasp = new Prs3d_ShadingAspect();
shasp->SetTransparency(1.0f);
shasp->Aspect()->SetEdgeWidth(2);

myDynHilightDrawer = new Prs3d_Drawer();
myDynHilightDrawer->Link(myDrawer);
myDynHilightDrawer->SetShadingAspect(shasp);
myDynHilightDrawer->SetFaceBoundaryDraw(true);
myDynHilightDrawer->SetDisplayMode(1);

myHilightDrawer = new Prs3d_Drawer();
myHilightDrawer->Link(myDrawer);
myHilightDrawer->SetShadingAspect(shasp);
myHilightDrawer->SetFaceBoundaryDraw(true);
myHilightDrawer->SetDisplayMode(1);

void MyAISObject::HilightOwnerWithColor(const Handle(PrsMgr_PresentationManager)& thePrsMgr, const Handle(Prs3d_Drawer)& theStyle, const Handle(SelectMgr_EntityOwner)& theOwner)
{
  thePrsMgr->Color(this, myDynHilightDrawer, myDynHilightDrawer->DisplayMode());
}

void MyAISObject::HilightSelected(const Handle(PrsMgr_PresentationManager)& thePrsMgr, const SelectMgr_SequenceOfOwner& theSeq)
{
  thePrsMgr->Color(this, myHilightDrawer, myHilightDrawer->DisplayMode());
}