I've got various Actions which are placed in a toolbar. How can I change
the toolTipText of these Actions dynamically, e.g. after processing the
run() method? Using setToolTipText anew doesn't seem to help. I would like
to have a toolbar item like the Run/Launch Button in the eclipse ide, i.e.
a dropdown menu, where the last used Action is shown as TooltipText and
can be triggered by simply clicking on the button and not on the arrow.