auto famelessWindow = std::make_unique<MainWindow>(nullptr, WindowType::AllButton);

framelessWindow->setCentralWidget(new [YourWidget]);

class MessageBoxDialog : public MainWindow
{
    MessageBoxDialog(){
        // ....
        setCentralWidget(contentWidget);
    }
}

CMAKE_ROOT # define cmake path, e.g. C:\Program Files\CMake\bin

VCPKG_ROOT # define vcpkg path, e.g. D:\vcpkg-export-20201126-140522

vcpkg install boost:x64-windows-mixed
vcpkg install pugixml:x64-windows-mixed
vcpkg install qt5-svg:x64-windows-mixed