protected override void OnStartup(StartupEventArgs e)
{
Window mainWindow = null;
// check some state or setting as appropriate
if (ConfigurationManager.AppSettings["AdvancedMode"] == "1")
{
mainWindow = new OtherWindow();
}
else
{
mainWindow = new MainWindow();
}
mainWindow.Show();
}
void OnOpenOtherWindow(object sender, RoutedEventArgs e)
{
var other = new OtherWindow();
other.Show();
}