I Need Help About Checkbox Tree
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I'm trying to do something like the example below, but I can't. How can I do that?

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You're looking for the CheckboxTree class.
There's the UI Inspector tool available that you may use next time, allows for inspecting any of the IDE UI components.
I found the Checkbox Tree before, but I do not fully understand its usage. I could not find a detailed documentation. Can you send me a simple code sample?
You can search the idea-community repository for the class occurrences to get some examples:
https://github.com/JetBrains/intellij-community/search?q=CheckboxTree
I found what I was looking for. Thank you for your help!