what is the most simplest way to add a black border around some widgets using the wx.BoxSizer property like this image below? i am currently learning how to use box sizer to implement in my application.

Here is my code:
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Check out the widget inspection tool. It can do outlining. You’ll just have to learn how it is doing it and then replicate the code. You can read about it on the wxPython wiki
The tool comes with wxPython.