VAGSuite.frmMain.dockPanel_ClosedPanel C# (CSharp) Метод

        void dockPanel_ClosedPanel(object sender, DevExpress.XtraBars.Docking.DockPanelEventArgs e)
        {
            if (sender is DockPanel)
            {
                DockPanel pnl = (DockPanel)sender;

                foreach (Control c in pnl.Controls)
                {
                    if (c is HexViewer)
                    {
                        HexViewer vwr = (HexViewer)c;
                        vwr.CloseFile();
                    }
                    else if (c is DevExpress.XtraBars.Docking.DockPanel)
                    {
                        DevExpress.XtraBars.Docking.DockPanel tpnl = (DevExpress.XtraBars.Docking.DockPanel)c;
                        foreach (Control c2 in tpnl.Controls)
                        {
                            if (c2 is HexViewer)
                            {
                                HexViewer vwr2 = (HexViewer)c2;
                                vwr2.CloseFile();
                            }
                        }
                    }
                    else if (c is DevExpress.XtraBars.Docking.ControlContainer)
                    {
                        DevExpress.XtraBars.Docking.ControlContainer cntr = (DevExpress.XtraBars.Docking.ControlContainer)c;
                        foreach (Control c3 in cntr.Controls)
                        {
                            if (c3 is HexViewer)
                            {
                                HexViewer vwr3 = (HexViewer)c3;
                                vwr3.CloseFile();
                            }
                        }
                    }
                }
                dockManager1.RemovePanel(pnl);
            }
        }