Add section arrow through toolkit

Hello,

I want to set the section arrow to a view. The section view is already on the drawing.

I tried this:

ui::printMessage("Select view for the arrow!");
pfcSelectionOptions_ptr opt = pfcSelectionOptions::Create("dwg_view");
opt->SetMaxNumSels(1);
viewArrow=session->Select(opt)->get(0)->GetSelView2D();

ui::printMessage("Select section view!");
pfcSelectionOptions_ptr opt2 = pfcSelectionOptions::Create("dwg_view");
pfcSelections_ptr sel = session->Select(opt2);
pfcView2D_ptr viewSection = sel->get(0)->GetSelView2D();

wfcSequenceofSection2DInstructions_ptr instrNew=wfcWView2D::cast(viewSection)->GetSection2DInstructions();

instrNew->get(0)->SetArrowDisplayView(viewArrow);

pfcModel2D::cast(mdl)->Regenerate();

It doesn't work.

Thanks for your help