             offset         : rtypes.number
             saved_mesg     : rtypes.string
             is_preview     : rtypes.bool
-            preview_button : rtypes.bool
         users :
             user_map : rtypes.immutable
         account :

            if @is_at_bottom()
                @debounce_bottom()
        else
            @props.actions.set_preview_button(true)
            @props.actions.set_is_preview(false)

    componentWillReceiveProps: (next) ->

                        <ButtonGroup>
                            {@render_timetravel_button()}
                            {@render_bottom_button()}
                        </ButtonGroup>
                    </Col>
                </Row>
