Marking selected vertex


I’m sorry for asking too many questions, but one more situation occured that I did not manage to cope with myself.

What is the best way to do this action:

When I select a node, I see light green rectangle around it. But if I press on white background, border disappears. I want to see this rectangle until I click on this vertex again (than it need to disaapear) or on another vertex (than I’d like to see a border around new, just selected vertex.

What is the best way to do this?

Did you get my email?