have padding maintain background color.
add valign. simpler way of rendering padding bg.
docs. fix line. fix attr objects.
add shrinkBox. add forms. add RadioSet. misc refactor.
do not set lastPos on render(true). remove old code.
allow style.hover and style.focus. no autofocus on buttons.
listbar and improve shrinkBox.
refactor shrink.
refactor. stop usign xi_, yi_.
more Box.render refactoring. docs. misc.
rename _lastPos to lpos.
refactor scrollbar. fix shrink comparisons.
refactor shrink.
replace shrink padding code.