title: Change button's background image programmatically in a metro style app
body: <p>How do I change a button's background image in a Metro Style app using VS 2012? 
  In Windows Forms, a button has a BackgroundImage property that you can set. 
  Is this feature available for Metro Style apps?</p>
  
  <p>In Windows Forms, I can do the following in C#:</p>
  
  <p>btnImage.BackgroundImage = System.Drawing.Image.FromFile("...\Pictures\flower.png");</p>
  
  <p>How can you programmatically change the button's background image in Metro Style apps ?</p>