title: How do I find the position of a widget relative to the window in tkinter?
body: <p>I need to find the position of a widget relative to the <strong>window</strong>.</p>
  <p>winfo_x returns the position relative to the widgets parent, this is a problem if the widget is in a frame.</p>
  <p>winfo_rootx returns the position relative to the screen, not the window.</p>