public MainWindow()
{
InitializeComponent();
StaticParams.ScreenWidth = System.Windows.SystemParameters.PrimaryScreenWidth;
StaticParams.ScreenHeight = System.Windows.SystemParameters.PrimaryScreenHeight;
Main.Width = ScreenWidth;
Main.Height = ScreenHeight;
MainFrame = new Frame();
MainFrame.NavigationUIVisibility = NavigationUIVisibility.Hidden;
Main.AddChild(MainFrame);
MainFrame.Navigate(new LoginPage());
}