DevExpress DockLayoutManager

using DevExpress.Xpf.Docking;
using DevExpress.Xpf.Layout.Core;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace Saatody.Module.Startup
{
    public partial class SaatodyApplication : Window
    {
        private StartPage StartPage = new StartPage();
        public SaatodyApplication()
        {
            InitializeComponent();
            Event();
        }

        private LayoutGroup Root = new LayoutGroup();
        private LayoutGroup LG = new LayoutGroup();
        private DocumentGroup DG = new DocumentGroup();
        private TabbedGroup TG = new TabbedGroup();

        private LayoutPanel LP = new LayoutPanel();
        private DocumentPanel DP = new DocumentPanel();
        private DocumentPanel TDP = new DocumentPanel();
        private LayoutPanel TP = new LayoutPanel();

        private void Event()
        {
            Dock.ShowingDockHints += (sender, e) => {
                if ((e.DraggingSource).GetType() == typeof(DocumentPanel))
                {
                    
                    if (((e.DraggingTarget).GetType() != typeof(DocumentGroup)) && ((e.DraggingTarget).GetType() != typeof(DocumentPanel)))
                    {
                        System.Console.WriteLine("1 Type: " + (e.DraggingTarget).GetType());
                        e.HideAll();
                    }
                    else if (((e.DraggingTarget).GetType() == typeof(DocumentGroup)) || ((e.DraggingTarget).GetType() == typeof(DocumentPanel)))
                    {
                        System.Console.WriteLine("2 Type: " + (e.DraggingTarget).GetType());
                        e.Hide(DockHint.AutoHideBottom);
                        e.Hide(DockHint.AutoHideLeft);
                        e.Hide(DockHint.AutoHideRight);
                        e.Hide(DockHint.AutoHideTop);
                        //e.Hide(DockHint.Center);
                        //e.Hide(DockHint.CenterBottom);
                        //e.Hide(DockHint.CenterLeft);
                        //e.Hide(DockHint.CenterRight);
                        //e.Hide(DockHint.CenterTop);
                        e.Hide(DockHint.SideBottom);
                        e.Hide(DockHint.SideLeft);
                        e.Hide(DockHint.SideRight);
                        e.Hide(DockHint.SideTop);
                        e.Hide(DockHint.TabBottom);
                        e.Hide(DockHint.TabHeader);
                        e.Hide(DockHint.TabLeft);
                        e.Hide(DockHint.TabRight);
                        e.Hide(DockHint.TabTop);
                    }
                }
            };

            this.Loaded += (sender, e) => {
                Dock.DockController.Dock(Root);
                Dock.DockController.Dock(LG);
                Dock.DockController.Dock(DG);
                Dock.DockController.Dock(TG);

                LP = new LayoutPanel();
                LP.Caption = "Layout";
                Dock.DockController.Dock(LP, LG, DockType.Fill);

                DP = new DocumentPanel();
                DP.Caption = "Document";
                Dock.DockController.Dock(DP, DG, DockType.Fill);
                TDP = DP;

                TP = new LayoutPanel();
                TP.Caption = "Tabbed";
                Dock.DockController.Dock(TP, TG, DockType.Fill);

                LG.Background = new SolidColorBrush(Color.FromRgb(255, 0, 0));
                DG.Background = new SolidColorBrush(Color.FromRgb(0, 255, 0));
                TG.Background = new SolidColorBrush(Color.FromRgb(0, 0, 255));

                LG.DestroyOnClosingChildren = false;
                DG.DestroyOnClosingChildren = false;
                TG.DestroyOnClosingChildren = false;
            };
            OpenNewProject.ItemClick += (sender, e) => {
                LP = new LayoutPanel();
                LP.Caption = "Layout";
                Dock.DockController.Dock(LP, LG, DockType.Fill);
            };
            OpenOpenProject.ItemClick += (sender, e) => {
                DP = new DocumentPanel();
                DP.Caption = "Document";
                if (Dock.ActiveDockItem != null)
                {
                    if (Dock.ActiveDockItem.GetType() == typeof(DocumentPanel)){
                        if (Dock.ActiveDockItem.IsFloating == false)
                        {
                            Dock.DockController.Dock(DP, Dock.ActiveDockItem, DockType.Fill);
                            TDP = DP;
                        }
                        else if (Dock.ActiveDockItem.IsFloating == true)
                        {
                            if (TDP.IsClosed == false)
                            {
                                if (TDP.IsFloating == false)
                                {
                                    Dock.DockController.Dock(DP, TDP, DockType.Fill);
                                    TDP = DP;
                                }
                                else if (TDP.IsFloating == true)
                                {
                                    // Any Group To Use For Fill
                                    Dock.DockController.Dock(DP, DG, DockType.Fill);
                                    TDP = DP;
                                }
                            }
                            else
                            {
                                // Any Group To Use For Fill
                                Dock.DockController.Dock(DP, DG, DockType.Fill);
                                TDP = DP;
                            }
                        }
                    }
                    else if(Dock.ActiveDockItem.GetType() != typeof(DocumentPanel))
                    {
                        if (TDP.IsClosed == false)
                        {
                            if (TDP.IsFloating == false)
                            {
                                Dock.DockController.Dock(DP, TDP, DockType.Fill);
                                TDP = DP;
                            }
                            else if (TDP.IsFloating == true)
                            {
                                // Any Group To Use For Fill
                                Dock.DockController.Dock(DP, DG, DockType.Fill);
                                TDP = DP;
                            }
                        }
                        else
                        {
                            // Any Group To Use For Fill
                            Dock.DockController.Dock(DP, DG, DockType.Fill);
                            TDP = DP;
                        }
                    }
                }
                else
                {
                    if (TDP.IsClosed == false)
                    {
                        Dock.DockController.Dock(DP, TDP, DockType.Fill);
                        TDP = DP;
                    }
                    else
                    {
                        // Any Group To Use For Fill
                        Dock.DockController.Dock(DP, DG, DockType.Fill);
                        TDP = DP;
                    }
                }
            };
            OpenStartPage.ItemClick += (sender, e) => {
                TP = new LayoutPanel();
                TP.Caption = "Tabbed";
                Dock.DockController.Dock(TP, TG, DockType.Fill);
            };
        }
    }
}