title: Getting position/width/height of MainWindow
body: <p>I'm wondering about the best way to get information about the current position and width/height of the MainWindow. I want to keep a child window inside the main window so I want to check the coordinates of the MainWindows borders during the move function of the child window.
  I could only find the Window.LocationChanged event but it doesn't solve my problem in a satisfying way. Are there better options?</p>