Demande aide pour evenement sur widget Canvas

#-*- coding: utf-8 -*-
from Tkinter import *
#-------------------------------------------------------------------------------
def Grille(fen,x,y):
    "Dessine la grille"
    taille_case=20
    canvas = Canvas(fen, width =x*taille_case+4, height=y*taille_case+4)

    i = 0
    while i < x:
        j = 0
        while j < y:
            canvas.create_rectangle((i*taille_case)+2,(j*taille_case)+2,((i+1)*taille_case)+2 , ((j+1)*taille_case)+2, fill='white')
            j+=1
        i+=1

    canvas.pack()

#-------------------------------------------------------------------------------
root = Tk()
Grille(root,25,25)
root.mainloop()

#-*- coding: utf-8 -*-
from Tkinter import *
#-------------------------------------------------------------------------------
def clic_button(num_button):
    lst_num_button[num_button].configure(bg = "grey")

def Grille(fen,x,y):
    "Dessine la grille"
    #"lst_num_button" contient l'identifiant de chaque bouton (instance)
    global lst_num_button
    lst_num_button = []

    i = 0
    while i < x:
        j = 0

        while j < y:
            b = Button(fen,height = 1, width = 2,
            #(i*x) + j = numéro du bouton de 0 a n
                command = lambda num_button = (i*x) + j:
                    clic_button(num_button))

            b.grid(row=i,column=j)
            lst_num_button.append(b)
            j+=1

        i+=1

#-------------------------------------------------------------------------------
root = Tk()
Grille(root,25,25)
root.mainloop()

#-*- coding: utf-8 -*-
from Tkinter import *
#-------------------------------------------------------------------------------
def Grille(fen,x,y):
    def onClick(event):
        monitem = canvas.find_closest(canvas.canvasx(event.x), canvas.canvasy(event.y))
        if canvas.itemcget(monitem, 'fill') == 'white':
            canvas.itemconfigure(monitem, fill='black')
        else:
            canvas.itemconfigure(monitem, fill='white')

    "Dessine la grille"
    taille_case=20
    canvas = Canvas(fen, width =x*taille_case+4, height=y*taille_case+4)

    i = 0
    while i < x:
        j = 0
        while j < y:
            canvas.create_rectangle((i*taille_case)+2,(j*taille_case)+2,((i+1)*taille_case)+2 , ((j+1)*taille_case)+2, fill='white')
            j+=1
        i+=1

    canvas.pack()
    canvas.bind('<ButtonRelease-1>', onClick)
#-------------------------------------------------------------------------------
def Apercu(fen,x,y):
    "Dessine l'aperçu"
    taille_case=5
    canvas = Canvas(fen, width =x*taille_case+4, height=y*taille_case+4)

    i = 0
    while i < x:
        j = 0
        while j < y:
            canvas.create_rectangle((i*taille_case)+2,(j*taille_case)+2,((i+1)*taille_case)+2 , ((j+1)*taille_case)+2, outline='white',fill='white')
            j+=1
        i+=1

    canvas.pack()
#-------------------------------------------------------------------------------
root = Tk()
Apercu(root,25,25)
Grille(root,25,25)
root.mainloop()

#-*- coding: utf-8 -*-
from Tkinter import *
#-------------------------------------------------------------------------------
def Grille(fen,x,y):
    def onClick(event):
        monitem = canvas.find_closest(canvas.canvasx(event.x), canvas.canvasy(event.y))
        print monitem
        if canvas.itemcget(monitem, 'fill') == 'white':
            canvas.itemconfigure(monitem, fill='black')
        else:
            canvas.itemconfigure(monitem, fill='white')

        if apercu.itemcget(monitem, 'fill') == 'white':
            apercu.itemconfigure(monitem, fill='black')
        else:
            apercu.itemconfigure(monitem, fill='white')

    "Dessine la grille"
    taille_case=20
    canvas = Canvas(fen, width =x*taille_case+4, height=y*taille_case+4)

    i = 0
    while i < x:
        j = 0
        while j < y:
            canvas.create_rectangle((i*taille_case)+2,(j*taille_case)+2,((i+1)*taille_case)+2 , ((j+1)*taille_case)+2, fill='white')
            j+=1
        i+=1

    canvas.pack()
    canvas.bind('<ButtonRelease-1>', onClick)
#-------------------------------------------------------------------------------
def Apercu(fen,x,y):
    "Dessine l'aperçu"
    taille_case=5
    apercu = Canvas(fen, width =x*taille_case+4, height=y*taille_case+4)

    i = 0
    while i < x:
        j = 0
        while j < y:
            apercu.create_rectangle((i*taille_case)+2,(j*taille_case)+2,((i+1)*taille_case)+2 , ((j+1)*taille_case)+2, outline='white',fill='white')
            j+=1
        i+=1

    apercu.pack()
    return apercu
#-------------------------------------------------------------------------------
root = Tk()
apercu=Apercu(root,25,25)
Grille(root,25,25)
root.mainloop()