gw_mail_window_box_create
gw_mail_window_box_get_main_window
gw_mail_window_box_get_to
gw_mail_window_box_get_cc
gw_mail_window_box_get_bcc
gw_mail_window_box_get_subject
gw_mail_window_box_get_msg
gw_mail_window_box_get_file_path
gw_mail_window_box_get_option_attach_file