「C#でタイトルバー透過」と同じように VC++でもApplicationViewTitleBarを操作します。
//App.xaml.cpp using namespace Windows::UI::ViewManagement; void App::OnLaunched(Windows::ApplicationModel::Activation::LaunchActivatedEventArgs^ e) { auto rootFrame = dynamic_cast<Frame^>(Window::Current->Content); Windows::ApplicationModel::Core::CoreApplication::GetCurrentView()->TitleBar->ExtendViewIntoTitleBar = true; ApplicationViewTitleBar^ titleBar = ApplicationView::GetForCurrentView()->TitleBar; titleBar->ForegroundColor = Windows::UI::Colors::White; titleBar->ButtonBackgroundColor = Windows::UI::Colors::Transparent; //ボタンバックグラウンドの透過 titleBar->ButtonInactiveBackgroundColor = Windows::UI::Colors::Transparent; titleBar->ButtonForegroundColor = Windows::UI::Colors::White; }