How to create a custom option in toolbox?

This is just a default Panel with 3 buttons where each button triggers its own command OpenStyleManager OpenTraitManager OpenBlocks <- being the last modified, use this as a starting point So if want to add a new button there you can use this

editor.Panels.addButton('views',{ // `views` is the panel's id
    id: 'yourBtnID',
    className: 'someClass',
    command: 'yourCommand',
    attributes: { title: 'Some title'},
})

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