Access mask vertex

Hi.

I was wondering if it's possible to access selected mask vertex? So far I was able to read number of vertices, but failing to identify witch one is selected.

Any ideas?

var comp = app.project.activeItem;

var myMask = comp.selectedLayers[0].mask(1);

var myProperty = myMask.maskPath;

var myShape = myProperty.value;

alert(myShape.vertices);