Prevent GUI layout from changing?

[skanemupp at yahoo.se]

when i added the results-LABEL the buttons have changed place.
meh why cant i just put buttons and stuff on a specific coordinate and
have them staying there?




#! /usr/bin/env python
from Tkinter import *
import tkMessageBox

class GUIFramework(Frame):
    """This is the GUI"""

    def __init__(self, master=None):
        """Initialize yourself"""

        self.expr = ""

        """Initialise the base class"""
        Frame.__init__(self,master)

        """Set the Window Title"""
        self.master.title("Calculator")

        """Display the main window"
        with a little bit of padding"""
        self.grid(padx=10,pady=10)
        self.CreateWidgets()



    def CreateWidgets(self):

##        """Create the Entry, set it to be a bit wider"""
##        self.enText = Entry(self)
##        self.enText.grid(row=0, column=0, columnspan=3)

        """Create the Button, set the text and the
        command that will be called when the button is clicked"""
        self.btnDisplay = Button(self, text="calculate!",
command=self.Calculate)
        self.btnDisplay.grid(row=0, column=31)

        """Create the Button, set the text and the
        command that will be called when the button is clicked"""
        self.lbText = Label(self, text="Results: ")
        self.lbText.grid(row=1, column=0)


        self.btnDisplay = Button(self,text='1',command=lambda
n="1":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=3, column=0, padx=5, pady=5)

        self.btnDisplay = Button(self,text='2',command=lambda
n="2":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=3, column=1, padx=5, pady=5)

        self.btnDisplay = Button(self,text='3',command=lambda
n="3":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=3, column=2, padx=5, pady=5)

        self.btnDisplay = Button(self,text='+',command=lambda
n="+":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=3, column=3, padx=5, pady=5)

        self.btnDisplay = Button(self,text='4',command=lambda
n="4":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=4, column=0, padx=5, pady=5)

        self.btnDisplay = Button(self,text='5',command=lambda
n="5":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=4, column=1, padx=5, pady=5)

        self.btnDisplay = Button(self,text='6',command=lambda
n="6":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=4, column=2, padx=5, pady=5)

        self.btnDisplay = Button(self,text='-',command=lambda
n="-":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=4, column=3, padx=5, pady=5)

        self.btnDisplay = Button(self,text='7',command=lambda
n="7":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=5, column=0, padx=5, pady=5)

        self.btnDisplay = Button(self,text='8',command=lambda
n="8":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=5, column=1, padx=5, pady=5)

        self.btnDisplay = Button(self,text='9',command=lambda
n="9":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=5, column=2, padx=5, pady=5)

        self.btnDisplay = Button(self,text='*',command=lambda
n="*":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=5, column=3, padx=5, pady=5)

        self.btnDisplay = Button(self,text='0',command=lambda
n="0":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=6, column=0, padx=5, pady=5)

        self.btnDisplay = Button(self,text='C',command=self.Clean)
        self.btnDisplay.grid(row=6, column=1, padx=5, pady=5)

        self.btnDisplay = Button(self,text='r',command=lambda
n="r":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=6, column=2, padx=5, pady=5)

        self.btnDisplay = Button(self,text='/',command=lambda
n="/":self.Display(n),width=1,height=1)
        self.btnDisplay.grid(row=6, column=3, padx=5, pady=5)




    def Display(self, number):
        self.expr = self.expr + number
        self.lbText = Label(self, text=self.expr)
        self.lbText.grid(row=0, column=0)

    def Calculate(self):
        self.expr = str(eval(self.expr))#try catch tex 3+6+
        self.lbText = Label(self, text=self.expr)
        self.lbText.grid(row=1, column=1)
        self.expr = ""

    def Clean(self):
        self.expr = ""
        #self.update()


if __name__ == "__main__":
    guiFrame = GUIFramework()
    guiFrame.mainloop()