title: Can't space listBox and buttons using tkinter
body: <p>I've created a new frame that will hold:
  -A label
  -A listbox
  -A button
  The frame is part of the main window.
  When I run the application, the label, listbox &amp; button are close to each other and I can't space them
  This is the partial code of the concerned parts:</p>
  
  <pre><code>
  
  from tkinter import *
  drsBlue='#004A99'
  
  
  class GUI:
  
      def __init__(self,):
          w = 520
          h = 350
          self.window = Tk()
          for i in range(0,3):
              self.window.columnconfigure(i, weight=1)
              self.window.rowconfigure(i, weight=1)
  
          ws = self.window.winfo_screenwidth()
          hs = self.window.winfo_screenheight()
          x = (ws/2) -(w/2)
          y = (hs/2) -(h/2)
          self.window.title("Invoice handling application")
          self.window.geometry('%dx%d+%d+%d' % (w, h, x, y))
          self.window.configure(bg=drsBlue)
          self.homeDirectory = r'C:/Users/Shtlrs/Desktop/Clients folder/'
          self.window.resizable(False,False)
  
          self.listBoxFrame = Frame(self.window, bg=drsBlue)
          self.listBoxFrame.grid(row=1,column=1)
          self.clientNamesLabel = Label(self.listBoxFrame,text="Please select a client from\n the following list")
          self.clientNamesLabel.grid(row=0, column=1)
  
          # clients listbox
          self.clientsListBox = Listbox(self.listBoxFrame)
          self.clientsListBox.grid(row=1, column=1)
  
          # ----List Box Frame----#
          self.backFromListBoxBtn = Button(self.listBoxFrame, text="Back", bg='#1b98e0', fg="white", width=20, height=2)
          for i in range(0,4):
              self.listBoxFrame.rowconfigure(i, weight=1)
              self.listBoxFrame.columnconfigure(i, weight=1)
          self.backFromListBoxBtn.grid(row=3, column=1)
          self.window.mainloop()
  
  
  if __name__ == '__main__':
      s=Gui()
  </code></pre>
  
  <p>And what I get is the following picture:
  <a href="https://i.stack.imgur.com/eC0KI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eC0KI.png" alt="enter image description here"></a></p>
  
  <p>What am I missing to space them apart ?</p>