python TK scrollbar problem

[Ray]

Hi,

would someone tell me how to make scrollbar work under grid?
I think I'm missing something to connect scrollbar with the grid.
following is some sample code. it shows the scrollbar, but it do not work.

Thanks a lot for the help!

Ray

#####code begin########
from Tkinter import *
def mygrid(text,M = []):	
	while M:
		x = M.pop()
		x.destroy()
	rows = []
	count=int(text)
	yscroll = Scrollbar(frame_grid, orient='vertical')
	yscroll.grid(rowspan=count, column=5, sticky=NS)
	M.append(yscroll)	
	for i in range(count):
		cols = []
		for j in range(4):
			e = Entry(frame_grid, relief=RIDGE)
			M.append(e)
			e.grid(row=i, column=j, sticky=NSEW)
			e.insert(END, '%d.%d' % (i, j))
			cols.append(e)
			rows.append(cols)
			
root=Tk()
frame_entry=Frame(root, width=550, height=100)
frame_entry.pack()
text=Entry(frame_entry)
text.pack(side=LEFT)
button=Button(frame_entry, text='generate grid', 
command=(lambda:mygrid(text.get())))
button.pack()
frame_space=Frame(root, width=550, height=100)
frame_space.pack()
frame_grid=Frame(root, width=550, height=300, relief=GROOVE)
frame_grid.pack()
frame_exit=Frame(root, width=550, height=100)
frame_exit.pack()
button2=Button(frame_exit, text='exit', command=root.quit)
button2.pack()
root.mainloop()