Pop out window - Visual Studio and/or Ubuntu files

[earnest plaza]

I want to create a pop-out window that's separate from the Studio/the file so I can do stuff like put a button on it, or put text on it, and Google hasn't helped. How might I do this?
I have no idea what like half of the tags are btw.

[safe dragon]

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[heavy skiff]

In windows you can use winapi to this