public String Ask() {
   return under.open();
 }
 public Gfui_dlg_file Init_exts_(String... v) {
   under.setFilterExtensions(v);
   return this;
 }
 public Gfui_dlg_file Init_file_(String v) {
   under.setFileName(v);
   return this;
 }
 public Gfui_dlg_file Init_dir_(Io_url v) {
   under.setFilterPath(v.Xto_api());
   return this;
 }
 public Gfui_dlg_file Init_msg_(String v) {
   under.setText(v);
   return this;
 }