title: Borderless window with shadow and blurbehind
body: <p>I tried <code>SetWindowCompositionAttribute</code> solution, and it worked well, but no shadows.<br>
  I tried combine blurbehind + apply shadow on window with <a href="https://stackoverflow.com/questions/3372303/dropshadow-for-wpf-borderless-window">DropShadow for WPF Borderless Window</a>  but here i got issue with unfocus/focus window lost transparancy.<br>
  Is it possible to make borderless window with blurbehind + shadow (and some close/min/max)?<br>
  Example: AMD Radeon Settings. Is it wpf? Or custom c++ solution.  </p>