title: Metro UI style close/minimize/maximize buttons
body: <p>how can I style the maximize/minimize/close buttons of an application to match the Metro UI version? I would do something like the one at right top corner: I'm using Qt 4.8 on Windows 7</p>
  
  <p><img src="https://i.stack.imgur.com/20rIj.png" alt="enter image description here"></p>