The RadWindow of Telefiks WPF components is a modal dialog but can also be used as main window with a few changes.
First we need to change the Window to "RadWindow":
In the App.xaml remove the Startup URI parameter:
Then change the App class:
public App()
{
}
protected override void OnStartup(StartupEventArgs e)
{
new MainWindow().Show();
base.OnStartup(e);
}
Thats it!