Removes a highlight segment from the collection of those that are highlighted.
HRESULT retVal = object.RemoveSegment(pISegment);
If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
IHighlightRenderingServices::RemoveSegment does not release the IHighlightSegment interface; you still need to call Release to free the IHighlightSegment interface (assuming you called AddRef when you created it).