public LoginForm()
{
InitializeComponent();
loginSubform.Show();
loginSubform.ChangeToRegisterUi += OnChangeToRegisterUi;
registrationSubform.Hide();
registrationSubform.ChangeToLoginUi += OnChangeToLoginUi;
this.AcceptButton = loginSubform.btnLogin;
loginSubform.Login += (o, e) => Login?.Invoke(this, e);
registrationSubform.Signup += (o, e) => Signup?.Invoke(this, e);
// TODO: uniform font
}