OpenTween.TweenMain.SelectTab C# (CSharp) Method

        private bool SelectTab(out string tabName)
        {
            do
            {
                tabName = null;

                //振り分け先タブ選択
                using (var dialog = new TabsDialog(_statuses))
                {
                    if (dialog.ShowDialog(this) == DialogResult.Cancel) return false;

                    var selectedTab = dialog.SelectedTab;
                    tabName = selectedTab == null ? null : selectedTab.TabName;
                }

                ListTab.SelectedTab.Focus();
                //新規タブを選択→タブ作成
                if (tabName == null)
                {
                    using (InputTabName inputName = new InputTabName())
                    {
                        inputName.TabName = _statuses.MakeTabName("MyTab");
                        inputName.ShowDialog();
                        if (inputName.DialogResult == DialogResult.Cancel) return false;
                        tabName = inputName.TabName;
                    }
                    this.TopMost = this._cfgCommon.AlwaysTop;
                    if (!string.IsNullOrEmpty(tabName))
                    {
                        var tab = new FilterTabModel(tabName);
                        if (!_statuses.AddTab(tab) || !AddNewTab(tab, startup: false))
                        {
                            string tmp = string.Format(Properties.Resources.IDRuleMenuItem_ClickText2, tabName);
                            MessageBox.Show(tmp, Properties.Resources.IDRuleMenuItem_ClickText3, MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                            //もう一度タブ名入力
                        }
                        else
                        {
                            return true;
                        }
                    }
                }
                else
                {
                    //既存タブを選択
                    return true;
                }
            }
            while (true);
        }