drop-down menus from buttons may have wrong width

[alex]

in the themeTester.html page, in the buttons tab, it's clear that many of the drop-downs from the buttons on that page have the wrong size and, perhaps, the wrong location.

A drop-down from a button should have a minimum (not maximum) width of the button itself. Without this, the menus look lethargic and like they don't quite belong.

There's a similar issue on combo boxes, but I'll file it under separate cover.

[bill]

This one's for Doug; the Combobox one is for Mark.

[bill]

(In [9323]) Make drop down menus at least as wide as the buttons. Had to remove outer div from the menus but they still look OK. Fixes #3408.