I have a window of the style 'button' I am creating with an optional window style "helptitle"

 local window = Window("button", menuItem.text, 'helptitle')

the helptitle style has the same format as a standard 'button' style window titlebar, but replaces rbutton from a now playing button to a help button

        s.helptitle            = _uses(s.minititle, {
                rbutton  = {
                        img = helpButton,
                },
        })
        s.pressed.helptitle = _uses(s.helptitle, {
                rbutton = {
                        img = helpButtonPressed,
                },
        })

the base style changes to a help button, but the pressed style does not take effect on press--displays the now playing button.