title: Move between typing boxes of the Entry widgets by using up and down arrow keys
body: <pre><code>from tkinter import *
  
  class Interface_graphique(Frame):
  
      def __init__(self, root, **kwargs):
          Frame.__init__(self, root, width=768, height=576, **kwargs)
          self.pack(fill=BOTH)
  
          self.message_1 = Label(self, text="value1")
          self.message_1.grid(row=0, sticky='w')
          self.entry_1 = Entry(self)
          self.entry_1.grid(row=0, column=1)
  
          self.message_2 = Label(self, text="value2")
          self.message_2.grid(row=1, sticky='w')
          self.entry_2 = Entry(self)
          self.entry_2.grid(row=1, column=1)
  
  root = Tk()
  interface = Interface_graphique(root)
  interface.mainloop()
  </code></pre>
  
  <p>I want to type in the Entry widget 'value1' and press the down arrow button to put the cursor in the Entry widget 'value2. Is it possible?</p>