Relay/RelayClient/App.xaml.cs

namespace RelayClient;

public partial class App : Application
{
    private bool _openedSecondWindow;

    public App()
    {
        InitializeComponent();
    }

    protected override Window CreateWindow(IActivationState? activationState)
    {
        var keeperWindow = new Window(new MainPage("Keeper317"))
        {
            Title = "Relay Client - Keeper317"
        };

        keeperWindow.Created += KeeperWindow_Created;

        return keeperWindow;
    }

    private void KeeperWindow_Created(object? sender, EventArgs e)
    {
        if (_openedSecondWindow)
            return;

        _openedSecondWindow = false;

        var kiraWindow = new Window(new MainPage("Ru_Kira"))
        {
            Title = "Relay Client - Ru_Kira"
        };

        Current?.OpenWindow(kiraWindow);
    }
}