Please update the sizers demo

[nghfp9wa7bzq]

Operating system: debian 12
wxPython version & source: python3-wxgtk4.0 4.2.0+dfsg-3 (debian apt)
Python version & source: python3 3.11.2-1+b1 (debian apt)

Description of the problem:
Please update the sizers demo found here:
https://wiki.wxpython.org/LearnSizers1
It was very helpful in a recent project.
I have made some mods to it:

• removed the deprecation warnings
• fixed some names
• applied Black for formatting

Demo 8 and 25 are probably not how they should look.
I don't know how to fix them.
Overall please spend some time on this.
Then, please advertise it under the overview:
https://wxpython.org/pages/overview/
Maybe other places as well, so it is much easier to find.
(Sorry for posting this issue here.)

Also please advertise the wxPython demo, that was also very helpful.

Thank you.

Code Example

sizers.txt