Sketch graphics edit Vertex

[KiroAndreev1]

Dear,

When edit with Sketch graphic, show verteh with number.This numbers start from 0.I would like to ask:

1. How to change verteh number to start from 1?
2. How to turn of mid vertex?
3. After used SketchEditor.SelectedVertexChanged Even i would like Verteh to be not selected.I would like default Verteh to be not Selected.I would like when click on Verteh to be selected.How to do this?

Best Regard