heyshamsw work-around

function mySidebar() {
    if ( (is_page(activity) || is_page(members) || is_page(groups) || is_page(fourms) || is_page(register) ) )
    {
        echo "<div id=\"mySidebar\">";
        echo "<div id=\"primary\" class=\"aside main-aside\">";
        echo do_shortcode('[widgets_on_pages id="bpSidebar"]');
        echo "</div>";
        echo "</div>";
    }
}
add_action('thematic_belowcontainer', 'mySidebar');