Python-GUI Button arrangement Help

[Bugcy 013]

Dear all,
I am new to python programming, I am developing some small
application, user agreement using Tkinter ,
totally my application having four buttons AGREE, DISAGREE , QUIT ,NEXT.
AGREE--->>Enable the Next Button
DISAGREE--->> One Waring message will show up yes are no
QUIT ---->> Quit the application
Next -->>Calling one python script exit the GUI
I have created application all working fine button will show up the
top of the screen..
i want show bottom of the frame... plz... Help me...


<code>
#! /usr/bin/python

from Tkinter import Tk, RIGHT, BOTH, RAISED
from ttk import Frame, Button, Style
import sys
import os
sys.path[:0] = ['../../..']
import string
import Tkinter
import Pmw
import wx
from Tkinter import *
import tkMessageBox
import gtk
b1 = 'True'
c1 = 'False'
a1 = 1



class Example(Frame):


   def __init__(self1, parent):
       Frame.__init__(self1, parent)

       self1.parent = parent

       self1.initUI()

       #fixedFont = Pmw.logicalfont('Fixed')
       self1.st = Pmw.ScrolledText(parent,
               labelpos = 'n',
               label_text='User Aggrement',


               usehullsize = 1,
               hull_width = 600,
               hull_height = 400,
               text_wrap='none',
               #text_font = fixedFont,

               text_padx = 4,
               text_pady = 4,
       )
       self1.st.importfile('python.txt');
       self1.st.pack(padx = 5, pady = 5, fill = 'both', expand = 1)

       # Prevent users' modifying text and headers
       self1.st.configure(text_state = 'disabled')

   def initUI(self1):

       self1.parent.title("User Aggrement")
       self1.style = Style()
       self1.style.theme_use("default")

       frame = Frame(self1, relief=RAISED, borderwidth=.5)
       frame.pack(fill=BOTH, expand=1)

       self1.pack(fill=BOTH, expand=1)

       def buttonPress(var):
               #print 'The "%s" button was pressed' % var
               if var == 'ok':
                       #os.system("ls -l") & os.system("man man")
                       widget.configure(state=NORMAL)
               elif var == 'dhana':
                       os.system("top") & exit()
               elif var == 'close':


                       a1 = tkMessageBox.askyesno("DisAgree", "Do you
really wish to Disagree?" )
                       #print a1

               if a1 == 1:
                       exit()

               else:
                       sys.exit


       widget = Tkinter.Button(self1, text='Next',command = lambda
b='dhana':     buttonPress(b) )
       widget.pack(side=RIGHT, padx=5, pady=5)
       widget.configure(state=DISABLED )


       def defaultKey(event):
               def make_widgets(self1):
                       buttonBox.invoke()
                       self1.make_widgets()

               root = Tkinter.tk()

       okButton = Tkinter.Button(self1, text="Quit",command =
sys.exit  , font=('Arial', 10), fg="black")
       okButton.pack(side=RIGHT, padx=5, pady=5)


       CloseButton = Tkinter.Button(self1, text="DisAgree",command =
lambda b='close':     buttonPress(b) , font=('Arial', 10), fg="black")
       CloseButton.pack(side=RIGHT, padx=5, pady=5)

       okButton = Tkinter.Button(self1, text="Agree",command = lambda
b='ok':     buttonPress(b) , font=('Arial', 10), fg="black")
       okButton.pack(side=RIGHT, padx=5, pady=5)
       okButton.focus_force()
       #self1.mainloop()

 ########################################################################################################################################

def main():

   root = Tkinter.Tk()
   root.geometry("600x400+30+30")
   app = Example(root)
   root.mainloop()


if __name__ == '__main__':
   main()
</code>