private void OnChangeWalletPassword(object sender, RoutedEventArgs e)
{
var dlg = new FormPassphrase();
dlg.labelOldPassword.Visibility = Visibility.Visible;
dlg.textOldPassword.Visibility = Visibility.Visible;
dlg.textOldPassword.Focus();
if (Dialog.ShowDialog(dlg, this)) {
Eng.ChangePassword(dlg.textOldPassword.Text, dlg.textPassword.Password);
}
}