I've got an app that displays two toolbars by default (one at the top,
the other at left), and may have a third and even a fourth.  All are set
to allow floating, so it's possible to have any or all of them moved to
a side where one already resides.

The tricky part, I found, is mainly dependent on what's on those
toolbars.  I have one that defaults to a vertical display at left and
has two columns of buttons.  It took far more work than I liked to be
able to ensure that those columns of buttons became a proper pair of
button rows when docked at top or bottom (that is, when the orientation
changed).  But the one that displays at the top, horizontally, creates
appearance issues if moved to a vertical location because one of the
items on it is a slider -- thus making it wider (when vertical) than I'd
like and having a less than ideal appearance.

But it does work.  And I can move them around freely.  The trick was
that I had to put together multiple JPanels with BorderLayout used and
designated locations for the default toolbar locations in certain
panels.  A little care is needed, but it's certainly doable.

= Steve =