void receiveHighlightedVertex(string ck, int index, bool flag)
This method must be exposed by the client if the client calls the MouseModeAPI method setHighlightVertexMode, parameterized for asynchronous response. In addition, the client must have previously called the MouseModeAPI method setReceiver.
The SDM provides the CARIS Key ck of a track, zero-based index of a vertex of that track, and highlighting flag for that vertex. If flag is TRUE/FALSE, the given vertex of the given track has just been highlighted/unhighlighted by the mouse click