show_labels

def show_labels(prefix = u""):

        labels = [
            lbn
            for lbn in renpy.get_all_labels().get_rollback()
            if lbn.lower().startswith(prefix)
            ]

        labels.sort()
        xadjustment = ui.adjustment()
        yadjustment = ui.adjustment()

        while True:

            ui.frame()
            ui.vbox()

            layout.label(_(u"Labels which starts with " + prefix), None)

            ui.textbutton(_(u"Close"), clicked=ui.returns(False), size_group="labels")

            ui.side(['c', 'b', 'r'], spacing=5)
            vp = ui.viewport(xadjustment=xadjustment, yadjustment=yadjustment, mousewheel=True)

            ui.vbox()

            for lbn in labels:
                ui.button(clicked=ui.returns(lbn), size_group="labels", xminimum=1.0)
                ui.text(lbn, style="button_text", xalign=0.0)

            ui.close()

            ui.bar(adjustment=xadjustment, style='scrollbar')
            ui.bar(adjustment=yadjustment, style='vscrollbar')
            ui.close()

            ui.close()

            rv = ui.interact()

            if rv is False:
                return

            renpy.jump(rv)