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[Larz60+]

I should have stated that.

I have only tested it on windows 7 pro 64 bit. Also, I used python 3.6.

I don't believe there are any system specific commands,
but can't be sure.

Would appreciate someone trying it on Linux and OS-X and let me know where problems
(if any) are found.

You may have to change the theme for it to look ok on another os.
To do so, first run the following snippet to see what's available:

import tkinter.ttk as ttk

s = ttk.Style()
print(s.theme_names())

On windows 7 this returns:

Output:
('winnative', 'clam', 'alt', 'default', 'classic', 'vista', 'xpnative')

change the line (in __init__):

self.s.theme_use('...')