title: Onclick Button open a new Window only with Image inside
body: <p>I am new to WPF and I've read a lot of answers, but none of them worked for me.
  I have a button with a <code>Click</code> method. When I click on it I want my program to show a new Window, only with an image inside, which URL is previously given. Can you show me the simplest way to create such <code>onclick</code> method ?</p>