OpenTween.TweenMain.RemoveSpecifiedTab C# (CSharp) Method

        public bool RemoveSpecifiedTab(string TabName, bool confirm)
        {
            var tabInfo = _statuses.GetTabByName(TabName);
            if (tabInfo.IsDefaultTabType || tabInfo.Protected) return false;

            if (confirm)
            {
                string tmp = string.Format(Properties.Resources.RemoveSpecifiedTabText1, Environment.NewLine);
                if (MessageBox.Show(tmp, TabName + " " + Properties.Resources.RemoveSpecifiedTabText2,
                                 MessageBoxButtons.OKCancel, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.Cancel)
                {
                    return false;
                }
            }

            var _tabPage = ListTab.TabPages.Cast<TabPage>().FirstOrDefault(tp => tp.Text == TabName);
            if (_tabPage == null) return false;

            SetListProperty();   //他のタブに列幅等を反映

            //オブジェクトインスタンスの削除
            DetailsListView _listCustom = (DetailsListView)_tabPage.Tag;
            _tabPage.Tag = null;

            using (ControlTransaction.Layout(this.SplitContainer1.Panel1, false))
            using (ControlTransaction.Layout(this.SplitContainer1.Panel2, false))
            using (ControlTransaction.Layout(this.SplitContainer1, false))
            using (ControlTransaction.Layout(this.ListTab, false))
            using (ControlTransaction.Layout(this))
            using (ControlTransaction.Layout(_tabPage, false))
            {
                if (this.ListTab.SelectedTab == _tabPage)
                {
                    this.ListTab.SelectTab((this._beforeSelectedTab != null && this.ListTab.TabPages.Contains(this._beforeSelectedTab)) ? this._beforeSelectedTab : this.ListTab.TabPages[0]);
                    this._beforeSelectedTab = null;
                }
                this.ListTab.Controls.Remove(_tabPage);

                // 後付けのコントロールを破棄
                if (tabInfo.TabType == MyCommon.TabUsageType.UserTimeline || tabInfo.TabType == MyCommon.TabUsageType.Lists)
                {
                    using (Control label = _tabPage.Controls["labelUser"])
                    {
                        _tabPage.Controls.Remove(label);
                    }
                }
                else if (tabInfo.TabType == MyCommon.TabUsageType.PublicSearch)
                {
                    using (Control pnl = _tabPage.Controls["panelSearch"])
                    {
                        pnl.Enter -= SearchControls_Enter;
                        pnl.Leave -= SearchControls_Leave;
                        _tabPage.Controls.Remove(pnl);

                        foreach (Control ctrl in pnl.Controls)
                        {
                            if (ctrl.Name == "buttonSearch")
                            {
                                ctrl.Click -= SearchButton_Click;
                            }
                            else if (ctrl.Name == "comboSearch")
                            {
                                ctrl.KeyDown -= SearchComboBox_KeyDown;
                            }
                            pnl.Controls.Remove(ctrl);
                            ctrl.Dispose();
                        }
                    }
                }

                _tabPage.Controls.Remove(_listCustom);

                _listCustom.SelectedIndexChanged -= MyList_SelectedIndexChanged;
                _listCustom.MouseDoubleClick -= MyList_MouseDoubleClick;
                _listCustom.ColumnClick -= MyList_ColumnClick;
                _listCustom.DrawColumnHeader -= MyList_DrawColumnHeader;
                _listCustom.DragDrop -= TweenMain_DragDrop;
                _listCustom.DragEnter -= TweenMain_DragEnter;
                _listCustom.DragOver -= TweenMain_DragOver;
                _listCustom.DrawItem -= MyList_DrawItem;
                _listCustom.MouseClick -= MyList_MouseClick;
                _listCustom.ColumnReordered -= MyList_ColumnReordered;
                _listCustom.ColumnWidthChanged -= MyList_ColumnWidthChanged;
                _listCustom.CacheVirtualItems -= MyList_CacheVirtualItems;
                _listCustom.RetrieveVirtualItem -= MyList_RetrieveVirtualItem;
                _listCustom.DrawSubItem -= MyList_DrawSubItem;
                _listCustom.HScrolled -= MyList_HScrolled;

                var cols = _listCustom.Columns.Cast<ColumnHeader>().ToList<ColumnHeader>();
                _listCustom.Columns.Clear();
                cols.ForEach(col => col.Dispose());
                cols.Clear();

                _listCustom.ContextMenuStrip = null;
                _listCustom.ColumnHeaderContextMenuStrip = null;
                _listCustom.Font = null;

                _listCustom.SmallImageList = null;
                _listCustom.ListViewItemSorter = null;

                //キャッシュのクリア
                if (_curTab.Equals(_tabPage))
                {
                    _curTab = null;
                    _curItemIndex = -1;
                    _curList = null;
                    _curPost = null;
                }
                this.PurgeListViewItemCache();
            }

            _tabPage.Dispose();
            _listCustom.Dispose();
            _statuses.RemoveTab(TabName);

            foreach (TabPage tp in ListTab.TabPages)
            {
                DetailsListView lst = (DetailsListView)tp.Tag;
                var count = _statuses.Tabs[tp.Text].AllCount;
                lst.VirtualListSize = count;
            }

            return true;
        }