title: RadWindow icon not shown in taskbar
body: <p>A <a href="https://stackoverflow.com/questions/25523357/rad-window-icon-not-displayed-on-task-bar-c-sharp-wpf">similar question</a> is wrongly marked as duplicate.</p>
  
  <p>The <a href="https://stackoverflow.com/a/25525839/361100">given answer</a> works, but it's not XAML-ish doing. My self-answer post below is recommended from Telerik.</p>