public static void Toggle(this Rectangle r)
{
RectangleTag t = (RectangleTag)r.Tag;
t.Board[t.Column, t.Row] = !t.Board[t.Column, t.Row];
r.UpdateFill();
}
public static void UpdateFill(this Rectangle r)
{
RectangleTag t = (RectangleTag)r.Tag;
r.Fill = t.Board[t.Column, t.Row] ? RectangleFactory.aliveBrush : RectangleFactory.deadBrush;
}