Select/format multiple elements' styles at once

[JohnNergeBrooklynPark]

When formatting the style of widgets, e.g. buttons, it'd be nice to be able to select multiple of them to edit their styles all at once. Right now if I want to change a button's background color or image, I have to select each button one at a time and change it, both for regular and hover. It'd be really helpful when making overall site changes to be able to apply those changes to all the buttons on the page, not unlike selecting multiple shapes, cells, etc. in Microsoft applications.