1  if (isMaxSized)
 2                     {
 3                         this.Width = normalRect.Width;
 4                         this.Height = normalRect.Height;
 5                         this.Left = normalRect.Left;
 6                         this.Top = normalRect.Top;
 7                         this.WindowState = WindowState.Normal;
 8                         this.isMaxSized = false; 
 9                         btn.Tag = "maxSize";
10                     }
11                     else
12                     {
13                         normalRect = new Rect(this.Left, this.Top, this.ActualWidth, this.ActualHeight);
14                         Rect rc = SystemParameters.WorkArea;
15                         this.Width = rc.Width;
16                         this.Height = rc.Height;
17                         this.Left = 0;
18                         this.Top = 0;
19                         this.isMaxSized = true; 
20                         btn.Tag = "normalSize";
21                     }

 1  var objKeyFrames = new ObjectAnimationUsingKeyFrames();
 2             objKeyFrames.Duration = TimeSpan.FromMilliseconds(100);
 3             objKeyFrames.KeyFrames.Add(new DiscreteObjectKeyFrame
 4             {
 5                 Value = new BitmapImage(new Uri(imgUrl, UriKind.Relative))
 6             });
 7             Storyboard story = new Storyboard();
 8             Storyboard.SetTarget(story, img);
 9             Storyboard.SetTargetProperty(story, new PropertyPath(Image.SourceProperty));
10             story.Children.Add(objKeyFrames);
11             story.Begin();