This is one of those, "whoa… i never knew this!" until someone shows you how to do it.

Go to Tools – Customize.  Now the Customize dialog box pops up.  Note that this is a semi-modal dialog (my made-up term, although there’s probably a real term for it somewhere).  A modal dialog is where you can only click inside the dialog.  This is true most of the time, but some dialog boxes are non-modal (where you can click outside the dialog box and focus is retained outside).

Work with me here.  Take your mouse and try to click+drag a button on any toolbar around here, there, and everywhere.  Trust me, it will work.  Crazy, huh?

Note that you can even duplicate items by doing a Ctrl+Drag.  The duplicate item can even live on a different toolbar!

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