Buttonset failed accessibility testing

Buttonset failed accessibility testing

We recently had our website fail accessibility testing because of buttonsets not giving any indication of keyboard focus being anywhere on them.  All other jquery ui widgets that we use do show keyboard focus.  Not this one.  Using the keyboard, it is quite difficult to use buttonsets (especially for checkboxes - radio buttons are a little easier) because you get zero visual indication as to what button in the buttonset currently has keyboard focus.  This is with jQueryUI 1.11.4 and with all themes.