Treeview is a type of widget.

The treeview widget that comes with tk since 8.5 is [ttk::treeview]. This treeview widget is intended to provide something that's a little more powerful (and faster) than the [BWidget::Tree] widget,
and a little bit simpler to use (though less powerful) than the [TkTreeCtrl] widget.

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[Sarnold] uses a BWidget [Tree] in which some data is associated with each entry.
'''ttk::treeview''' does not seem - to my great surprise - to handle other data than the text.
Is it true ? Is adding such a feature planned ?

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