[Tkinter] ListBox not contained or scrollable

[Larz60+]

I'm not sure that wxformbuilder is up to date, check it out first.
If you want to get a real taste for wxpython try the following (you can delete afterwards if you decide it's not for you)
Following for windows, Linux will be the same for some distros, but not all

• install wxpython phoenix with pip (you must be running python 3 by default or you will get the wrong version of wxpython)
  

  pip install wxpython

• In browser, navigate to: https://github.com/wxWidgets/Phoenix
  
• Download zip (or from command line, if you have git installed:

  git clone https://github.com/wxWidgets/Phoenix

• Extract the zip of tar file in a preselected directory
  
• Navigate to Phoenix-master\demo
  
• From command line, run

  python demo.py

• You'll get a sync error which can be ignored.
  

Look around in the demo and exmaine the source code needed to create various widgets.
I think you will be surpeised and delighted by what you find.