+ cpi = row[_model.protocol_info];
+ if (!cpi || !cpi->protocol || !cpi->protocol->has_editor ()) {
+ return;
+ }
+ Box* box = (Box*) cpi->protocol->get_gui ();
+ if (!box) {
+ return;
+ }
+ if (box->get_parent()) {
+ static_cast<ArdourWindow*>(box->get_parent())->present();
+ return;
+ }
+ string title = row[_model.name];
+ /* once created, the window is managed by the surface itself (as ->get_parent())
+ * Surface's tear_down_gui() is called on session close, when de-activating
+ * or re-initializing a surface.
+ * tear_down_gui() hides an deletes the Window if it exists.
+ */
+ ArdourWindow* win = new ArdourWindow (_parent, title);
+ win->set_title ("Control Protocol Options");
+ win->add (*box);
+ box->show ();
+ win->present ();