//draw a circle in stackPanel
private void DrawCircle(Storyboard sb, Canvas cv)
{
Ellipse el = new Ellipse();
el.Margin = new Thickness(13, 8, 0, 0);
el.Width = 0;
el.Height = 0;
el.Stroke = Brushes.Blue;
el.StrokeThickness = 10;
cv.Children.Add(el);
DoubleAnimation widthAnimation = new DoubleAnimation(el.Width, 90, new Duration(new TimeSpan(0, 0, 1)));
DoubleAnimation heightAnimation = new DoubleAnimation(el.Height, 80, new Duration(new TimeSpan(0, 0, 1)));
Storyboard.SetTargetProperty(widthAnimation, new PropertyPath(Ellipse.WidthProperty));
Storyboard.SetTargetProperty(heightAnimation, new PropertyPath(Ellipse.HeightProperty));
sb.Children.Add(widthAnimation);
sb.Children.Add(heightAnimation);
el.BeginStoryboard(sb);
}
