Add use scanner.

src/windows/MainWindow.cpp

@@ -92,6 +92,14 @@ MainWindow::MainWindow(QWidget* aParent)
         this->update();
         QApplication::processEvents();
     });
+
+    connect(mTabWidget, &QTabWidget::currentChanged, this, [this](int aIndex)
+    {
+       if(aIndex == 1)
+       {
+           mTabWidget->widget(1)->setFocus();
+       }
+    });
             
     GUIErrorHandle::Default()->init();
     QApplication::setActiveWindow(centralWidget());