title: Event binding to detect a grid_remove (Tkinter)
body: <p>I'm setting up a Tkinter GUI in Python (2.7). There's one place where I plan to create a collection of similar widgets, using <code>grid()</code> and <code>grid_remove()</code> to select which one of them will be visible at a particular spot on the main window.  I have a working prototype, but the only behavioral hitch is that when I <code>grid_remove()</code> a widget to hide it, the widget retains focus -- and even responds to keyboard events.</p>
  
  <p>Is there some event binding I can use to automatically detect a <code>grid_remove()</code> and force the widget to pass the focus elsewhere?  Or do I have to just put the focus change in the button code that will do the <code>grid_remove()</code> itself?</p>