title: Child window does not stay on top after file selection
body: <p>I've constructed a user interface (UI) using Python's (2.7) Tkinter. The UI has buttons that allow the user to access a second window. On this child window, the user clicks a button that allows them to search for a file of a specific filetype.</p>
  
  <p>Problem: However, after the user selects the file, the child window falls behind the main window. How can I force the child window to stay on top, at least until the user is done w/ the form?</p>