control_ui->controller->set_size_request (200, req.height);
control_ui->controller->set_name (X_("PluginSlider"));
control_ui->controller->set_style (BarController::LeftToRight);
control_ui->controller->set_size_request (200, req.height);
control_ui->controller->set_name (X_("PluginSlider"));
control_ui->controller->set_style (BarController::LeftToRight);