float scale=15; // 振れ幅
double speed=10; // (角度/フレーム)
PointFProperty pos = (PointFProperty)ExpressionUtils.GetProperty(Property.ThisProperty, "位置");
//pos.X = pos.X + ( (float)Math.Cos(speed * Property.Index * Math.PI / 180) * scale );
pos.Y = pos.Y + ( (float)Math.Sin(speed * Property.Index * Math.PI / 180) * scale );