title: tkcalendar: Change output configuration for DateEntry()
body: <p>I am using the tkcalendar module that I just downloaded and would like to change the ~result~ background color and position if possible.  The code I found on line is below;</p>
  
  <pre><code>try:
      import tkinter as tk
      from tkinter import ttk
  except ImportError:
      import Tkinter as tk
      import ttk
  
  from tkcalendar import Calendar, DateEntry
  
  def example1():
      def print_sel():
          print(cal.selection_get())
  
      top = tk.Toplevel(root)
  
      cal = Calendar(top, font="Arial 14", selectmode='day', locale='en_US',
                     cursor="hand1", year=2018, month=2, day=5)
  
      cal.pack(fill="both", expand=True)
      ttk.Button(top, text="ok", command=print_sel).pack()
  
  
  def example2():
  
      top = tk.Toplevel(root)
  
      cal = Calendar(top, selectmode='none')
      date = cal.datetime.today() + cal.timedelta(days=2)
      cal.calevent_create(date, 'Hello World', 'message')
      cal.calevent_create(date, 'Reminder 2', 'reminder')
      cal.calevent_create(date + cal.timedelta(days=-2), 'Reminder 1', 'reminder')
      cal.calevent_create(date + cal.timedelta(days=3), 'Message', 'message')
  
      cal.tag_config('reminder', background='red', foreground='yellow')
  
      cal.pack(fill="both", expand=True)
      ttk.Label(top, text="Hover over the events.").pack()
  
  
  def example3():
      top = tk.Toplevel(root)
  
      ttk.Label(top, text='Choose date').pack(padx=10, pady=10)
  
      cal = DateEntry(top, width=12, background='darkblue',
                      foreground='white', borderwidth=2, year=2018)
      cal.pack(padx=10, pady=10)
  
  
  
  
  
  root = tk.Tk()
  ttk.Button(root, text='Calendar', command=example1).pack(padx=10, pady=10)
  ttk.Button(root, text='Calendar with events', command=example2).pack(padx=10, pady=10)
  ttk.Button(root, text='DateEntry', command=example3).pack(padx=10, pady=10)
  
  root.mainloop()
  </code></pre>
  
  <p>This actually runs fine.  I see the main root window below;</p>
  
  <p><img src="https://i.stack.imgur.com/OExaY.png" alt="screenshot 1"></p>
  
  <p>Now, when I select "DateEntry", once again everything is fine.  I get the calendar pop up and I can select a date.  But when I'm done selecting my date, I get the graphic below;</p>
  
  <p><img src="https://i.stack.imgur.com/66ebl.png" alt="screenshot 2"></p>
  
  <p>I would like to change the background color on the date and center the 8/29/18 in the center.  I have not found any way to accomplish this.  Any help would be appreciated.</p>
  
  <p>~OldManEd</p>