private void btnSoundsSettings_Click(object sender, RoutedEventArgs e)
        {
            if (this.cbSounds.SelectedIndex > -1)
            {
                int        index   = cbSounds.SelectedIndex;
                SoundsForm setting = new SoundsForm(true, index);

                setting.ShowDialog();

                if (setting.DialogResult.HasValue && setting.DialogResult.Value)
                {
                    this.RefreshSoundsList();

                    this.cbSounds.SelectedIndex = index;
                }
            }
        }
        private void btnSoundsAdd_Click(object sender, RoutedEventArgs e)
        {
            if (this.cbPages.SelectedIndex > -1)
            {
                SoundsForm add = new SoundsForm();

                add.ShowDialog();

                if (add.DialogResult.HasValue && add.DialogResult.Value)
                {
                    RefreshSoundsList();
                }

                this.cbSounds.SelectedIndex = this.cbSounds.Items.Count - 1;
            }
            else
            {
                showPageNotSelectedError();
            }
        }