private static void Main()
{
var screen = new Screen();
for (int i = 0; i < 10; i++) {
screen.Add(new Shape {Location = new Point(i, i), Color = Color.Red});
}
using (var tracker = new Tracker().Track(screen)) {
tracker.Changed += _ => Console.WriteLine("Changed!");
screen.Add(new Shape()); // "Changed!" x 2 (1 for new element, 1 for Count property change)
screen[0].Location = new Point(1, 1); // "Changed!"
screen[1].Color = Color.Blue; // "Changed!"
screen.RemoveAt(2); // "Changed!" x 2
}
}
