title: tkcalendar takes a lot of time to load when I try to add more than 10 calendar widgets
body: <p>Hi I have a code where I have a button which adds calender widgets, when I add more than 10 or 11 widgets, the program lags a lot. It takes a lot of time to insert the widget, could someone please help me how to circumvent this issue ? </p>
  
  <pre><code>from tkinter import Button, Tk
  from tkcalendar import  DateEntry
  
  root = Tk()
  Date = []
  
  def Add():
      Date.append({})
      n = len(Date)-1
      Date[n]= DateEntry(root)
      Date[n].grid(row=n+1, column=0)
      print (n)
  
  button = Button(root, text='Add', command=Add).grid(row=0, column=0)
  </code></pre>