Scrollbar for thumbnails

I am having a terrible time wrapping this under my head.

What is missing here to have the scrollbar working.

Everything is displayed fine.  But the slider of the scrollbar is full 
length. i.e. same height as outerframe.  which is same size as the canvas.

     def setup(self):
         c = 0
         r = 0
         outer_frame = Frame(self, bg='red', padx=2, pady=2)
         outer_frame.pack()
         scrollbar = Scrollbar(outer_frame)
         scrollbar.pack( side = RIGHT, fill=Y )

         canvas = Canvas(outer_frame, height=100, 
scrollregion=(0,0,300,300), yscrollcommand=scrollbar.set)
         canvas.pack(side=LEFT, expand=YES, fill=BOTH)
         scrollbar.config(command=canvas.yview)

         for f in os.listdir(self.thumbnail_folder):
             fpath = os.path.join(self.thumbnail_folder, f)
             photo = PhotoImage(file=fpath)
             photo_frame = Frame(canvas, bg='white', padx=2, pady=2)
             lbl_photo = Label(photo_frame, image=photo, text=f)
lbl_photo.bind("<ButtonRelease-1>",self.photo_click)
             lbl_photo.image=photo
             lbl_photo.pack()
             lbl_name = Label(photo_frame, text=f.split('.')[0])
lbl_name.bind("<ButtonRelease-1>",self.photo_click)
             lbl_name.pack()
             photo_frame.grid(row=r, column=c)
             if c > 2:
                 c = 0
                 r = r + 1
             else:
                 c = c + 1

Regards

Mario St-Gelais

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