For example, how to make such buttons so that they look like this? 
Where can I read about it?
You can create your own component inherited from Button . But another option is to use CheckBox . To do this, set the Appearance property to the Button . And play FlatStyle with the FlatStyle properties (set in a Popup , most likely in my opinion) and FlatAppearance .
Creating a second window application in C # - look at this link, I hope it will help you.
Source: https://ru.stackoverflow.com/questions/31599/
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