Silverlight / WPF - Append an image to the button content - programmatically

Hi,
I have an issue with appending an image to a programmatically created button. I tried using the following
textbutton.Content = new ImageBrush { ImageSource = new BitmapImage(new Uri("Picasso.jpg", UriKind.Relative)), Stretch = Stretch.Fill };
But it is not working. It is just showing System.Windows.Image and not the image.

Please help to resolve this issue.

Thanks,
Rohini

            Button b1 = new Button();

            this.Controls.Add(b1);

 

            ImageList i1 = new ImageList();

            i1.Images.Add(Image.FromFile("e:/hi.jpg"));

 

            b1.ImageList = i1;

            b1.ImageIndex = 0;