A simple PulloutToolbar based on enyo.Popup
Requires https://github.com/enyojs/layout and https://github.com/enyojs/onyx
Right/bottom PulloutToolbars cause broswer windows to scroll when hidden except in desktop Safari.
Pulltab position "center" isn't really centered. It uses percentages to position offset from left or top and can look "not-centered" when resizing to smaller viewports.