I found any variant of animating rectangle with using double animation
Rectangle myRectangle;
Storyboard sb;
//creating rectangle
myRectangle = new Rectangle();
myRectangle.Width = 200;
myRectangle.Height = 200;
Color myColor = Color.FromArgb(255, 255, 0, 0);
SolidColorBrush myBrush = new SolidColorBrush();
myBrush.Color = myColor;
myRectangle.Fill = myBrush;
// Create the transform
TranslateTransform moveTransform = new TranslateTransform();
moveTransform.X = 0;
moveTransform.Y = 0;
myRectangle.RenderTransform = moveTransform;
// Add the rectangle to the tree.
if (!LayoutRoot.Children.Contains(myRectangle)) LayoutRoot.Children.Add(myRectangle);
// Create a duration of 2 seconds.
Duration duration = new Duration(TimeSpan.FromSeconds(1.0));
// Create two DoubleAnimations and set their properties.
DoubleAnimation myDoubleAnimationX = new DoubleAnimation();
sb = new Storyboard();
sb.Duration = duration;
sb.Children.Add(myDoubleAnimationX);
Storyboard.SetTarget(myDoubleAnimationX, moveTransform);
Storyboard.SetTargetProperty(myDoubleAnimationX, new PropertyPath("X"));
DoubleAnimation myDoubleAnimationY = new DoubleAnimation();
sb.Children.Add(myDoubleAnimationY);
Storyboard.SetTarget(myDoubleAnimationY, moveTransform);
Storyboard.SetTargetProperty(myDoubleAnimationY, new PropertyPath("Y"));
myDoubleAnimationX.To = 0;
myDoubleAnimationX.From = 340;
myDoubleAnimationY.To = 0;
myDoubleAnimationY.From = 340;
// Make the Storyboard a resource.
if (!LayoutRoot.Resources.Contains("unique_id")) LayoutRoot.Resources.Add("unique_id", sb);
sb.Begin();