OpenTween.TweenMain.ContextMenuTabProperty_Opening C# (CSharp) Method

        private void ContextMenuTabProperty_Opening(object sender, CancelEventArgs e)
        {
            //右クリックの場合はタブ名が設定済。アプリケーションキーの場合は現在のタブを対象とする
            if (string.IsNullOrEmpty(_rclickTabName) || sender != ContextMenuTabProperty)
            {
                if (ListTab != null && ListTab.SelectedTab != null)
                    _rclickTabName = ListTab.SelectedTab.Text;
                else
                    return;
            }

            if (_statuses == null) return;
            if (_statuses.Tabs == null) return;

            TabModel tb;
            if (!this._statuses.Tabs.TryGetValue(this._rclickTabName, out tb))
                return;

            NotifyDispMenuItem.Checked = tb.Notify;
            this.NotifyTbMenuItem.Checked = tb.Notify;

            soundfileListup = true;
            SoundFileComboBox.Items.Clear();
            this.SoundFileTbComboBox.Items.Clear();
            SoundFileComboBox.Items.Add("");
            this.SoundFileTbComboBox.Items.Add("");
            DirectoryInfo oDir = new DirectoryInfo(Application.StartupPath + Path.DirectorySeparatorChar);
            if (Directory.Exists(Path.Combine(Application.StartupPath, "Sounds")))
            {
                oDir = oDir.GetDirectories("Sounds")[0];
            }
            foreach (FileInfo oFile in oDir.GetFiles("*.wav"))
            {
                SoundFileComboBox.Items.Add(oFile.Name);
                this.SoundFileTbComboBox.Items.Add(oFile.Name);
            }
            int idx = SoundFileComboBox.Items.IndexOf(tb.SoundFile);
            if (idx == -1) idx = 0;
            SoundFileComboBox.SelectedIndex = idx;
            this.SoundFileTbComboBox.SelectedIndex = idx;
            soundfileListup = false;
            UreadManageMenuItem.Checked = tb.UnreadManage;
            this.UnreadMngTbMenuItem.Checked = tb.UnreadManage;

            TabMenuControl(_rclickTabName);
        }