Toolbar is a pretty common term.  So the reader should not be surprised
if they find various ways of creating such a thing.
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For instance, Iwidgets has a toolbar command:

[http://incrtcl.sourceforge.net/iwidgets/iwidgets/toolbar.gif]

Docs can be found at http://incrtcl.sourceforge.net/iwidgets/iwidgets/toolbar.html and http://purl.org/tcl/home/man/iwidgets3.0/toolbar.n.html
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http://www.iit.demokritos.gr/~petasis/Tcl/toolbar.tcl provides dockable toolbars.
See also [ClassyTk] (and [mkImagesPane] for code that could be used to create
a toolbar).

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[Bwidget] has a MainFrame widget, which includes a toolbar created as a ButtonBox (a series of Bwidget buttons).

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[Category Command], a part of [incr Widgets]

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[Category GUI]