How to highlight one connecting line in Simulink?

I want to highlight one specified connecting line in Simulink. But when I tried vdp, find_system returns all lines handles of the model. But when use hilite_system(lineHandle) to highlight one specified connecting line, different handles show the same highlighting! It seems that for some line handles, although they have different line handle values, but refer to the same group of lines.

if true
  % code
L = find_system('mvdp','FindAll','on','type','line');
hilite_system(L(6));
hilite_system(L(7));
end

L(6) and L(7) both highlight a group of lines. That's not what I want. Hope one single line is highlighted when it's src and dst handles are given

Answer 1

[GK]

Hi, As I checked, for a single line originating from 1 port of 1 block,

No of linehandles = no of lines between nodes.

Please check screenshot where 'x1' line has 6 line handles.