diff --git a/saoriwindow.cpp b/saoriwindow.cpp
index 515021b..6387050 100644
--- a/saoriwindow.cpp
+++ b/saoriwindow.cpp
@@ -136,3 +136,13 @@
         openView(QStringList() << item->text(1) << item->text(2));
     }
 }
+
+void SaoriWindow::on_actionTabbedView_mode_toggled(bool arg1)
+{
+    if (ui->mdiArea->viewMode() == QMdiArea::TabbedView) {
+        if (arg1 == false) ui->mdiArea->setViewMode(QMdiArea::SubWindowView);
+    } else {
+        if (arg1 == true) ui->mdiArea->setViewMode(QMdiArea::TabbedView);
+    }
+    return;
+}
diff --git a/saoriwindow.h b/saoriwindow.h
index 50a86cb..6b3cdfe 100644
--- a/saoriwindow.h
+++ b/saoriwindow.h
@@ -56,6 +56,8 @@
 private slots:
     void on_timelineTree_itemDoubleClicked(QTreeWidgetItem *item, int);
 
+    void on_actionTabbedView_mode_toggled(bool arg1);
+
 private:
     Ui::SaoriWindow *ui;
 };