Image Canvas delete elements

Dear All,
I'm playing a little bit with Tkinter, and I have started playing on Image slider. I would like to create a simple window which change the image based on a simple button. Furthermore, if the 'remove' button is clicked, the actual image is removed and never show up again. I was able to found a very nice working example, but I'm not able to develop the 'remove' button.
I copy and paste a code that I have found on the web:
from Tkinter import *#----------------------------------------------------------------------class MainWindow():    #----------------    def __init__(self, main):        # canvas for image        self.canvas = Canvas(main, width=60, height=60)        self.canvas.grid(row=0, column=0)        # images        self.my_images = []        self.my_images.append(PhotoImage(file = "ball1.gif"))        self.my_images.append(PhotoImage(file = "ball2.gif"))        self.my_images.append(PhotoImage(file = "ball3.gif"))        self.my_image_number = 0        # set first image on canvas        self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])        # button to change image        self.button = Button(main, text="Change", command=self.onButton)        self.button.grid(row=1, column=0)    #----------------    def onButton(self):        # next image        self.my_image_number += 1        # return to first image        if self.my_image_number == len(self.my_images):            self.my_image_number = 0        # change image        self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])#----------------------------------------------------------------------root = Tk()MainWindow(root)root.mainloop()
To remove the image, I have added a new button which remove the image. Here it is:
....        self.button_2 = Button(main, text="Change", command=self.onButton_2)        self.button_2.grid(row=2, column=0)
 def onButton_2(self):        #remove image        self.my_images_name.remove(self.my_images_name[self.my_image_number])        # next image        self.my_image_number += 1        # return to first image        if self.my_image_number == len(self.my_images):            self.my_image_number = 0        # change image        self.canvas.itemconfig(self.image_on_canvas, image = self.my_images[self.my_image_number])....
The image is actually removed when I print the list of images but, unfortunately, it keeps appearing on my canvas. I've also tried to remove the canvas and add another one using these code-lines:
...#delete canvasself.canvas.delete(self.image_on_canvas)#add new canvasself.canvas = Canvas( width=60, height=60)self.canvas.grid(row=0, column=0)self.image_on_canvas = self.canvas.create_image(0, 0, anchor = NW, image = self.my_images[self.my_image_number])...
Do you have any idea? I have google it but I was not able to find a solution. I have also tried to update the widget with no success. 
Thanks in advance!GC

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