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macOS Windows 'Babyscript' Tutorial question

I know this tutorial is old and locked, but I thought I’d ask the question here.

In the tutorial it shows the ‘tabbed’ option for multiple windows, such that each text windows is docked in the main windows and each is available from an automatic tab.

It is possible to drag one of these tabs ‘off’ of the menu and into a separate window.

My question is, is there the ability in the macOS SDK to drag this new window back into the main and make it tabbed again? Because this behaviour is not working in the final ‘demo’ code.

Thanks.