popupMenu: m["xx"] has id=0

[Gintaras]

To detect Cancel can be used m.Result.

Code:

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var m = new popupMenu();
m["x1"] = o => { print.it(o.Id); }; //no id
m.Add(5, "Explicitly set id");
m.Add("Auto-generated id");
m.Add("Explicitly set id", o => { print.it(o.Id); }).Id = 100;
int sel = m.Show();
print.it(sel, m.Result); //m.Result null if canceled