solidworks highlight problem

Dear all,
Now I can access the edge entity from solidworks, but I could not
highlight it by its API, I am using C++, so I would like to ask if
there is any people could give me some suggestion. The following is a
rough coding for reference:
VARIANT_BOOL hg;
edge->IHighlight(hg);
ActiveView->DrawHighlightedItems();
Thank you very much for your kind help.

 

Are you using the selection manager to get the edge?

 

no I am not using the selection manager. but now I do not use
highlight, instead I use set color function, so that I can get the same
effect.
Thank you very much for your repy and sorry for my late reply.
hope I could have your help next time, thanks.

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