Tkinter, problem when using 2 scrollbars

[Roberto Ferreras]

First, it's my first program with Tkinter ...

Ok, I have a Listbox with two Scrollbars around it. But they "overlap" at
the bottom right corner. One is a bit larger than the other, ie, the
verticall scrollbar goes from the top of the Listbox to the bottom of the
horizontal Scrollbar.

How can I avoid that? How can I put an empty square so the vertical Sb has
the height of the Lb and the horizontal Sb the width of the Lb?

Thanks.