Drag & drop clusterfuck

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using HCI_Projekat.klase;
using HCI_Projekat.klase.handlers;

namespace HCI_Projekat.forme
{
    public partial class frmMapa : Form
    {
        private TreeNode _draggedIndexItem;
        private Point _screenOffset;
        private Rectangle _mouseDownSelectionWindow;
        private int x, y;
        private Image selImg;
        Point position;

        public frmMapa()
        {
            InitializeComponent();
            populateTrewView();
            tvIcon.ExpandAll();

            pMap.AllowDrop = true;

            _mouseDownSelectionWindow = Rectangle.Empty;
        }

        private void frmMapa_Load(object sender, EventArgs e)
        {
            List<IkoniceKoord> icon = Ikonice.getInstance().getIkonice();

            foreach (IkoniceKoord ikItr in icon)
            {
                PictureBox pb = new PictureBox();
                CustomToolTip ctt = new CustomToolTip();

                pb.Location = new Point(ikItr.x, ikItr.y);
                pb.Image = ikItr.icon;
                pb.BackColor = Color.Transparent;
                pb.Tag = pb.Image;
                pb.Size = new Size(ikItr.icon.Width, ikItr.icon.Height);
                ctt.SetToolTip(pb, ikItr.tTip);
          //    MessageBox.Show(ikItr.x + " | " + ikItr.y + " | " + ikItr.icon.ToString());
                pMap.Controls.Add(pb);
            }
        }

        private void populateTrewView()
        {
            List<ZivotinjskeVrste> zv = Zivotinje.getInstance().getZivotinjskeVrste();
            ImageList imgList = new ImageList();
            TreeNode root = tvIcon.Nodes.Add("Životinje");
            TreeNode items = root;

            if (Zivotinje.getInstance().getZivotinjskeVrste() != null)
            {
            /*    foreach (ZivotinjskeVrste zvItr in zv)
                {
                    imgList.Images.Add(zvItr.Ikona);
                    items = root.Nodes.Add(zvItr.Ime);
                    items.ImageIndex = 0;
                    items.SelectedImageIndex = 0;
                } */

                for (int i = 0; i < Zivotinje.getInstance().getZivotinjskeVrste().Count; i++)
                {
                    items = root.Nodes.Add(Zivotinje.getInstance().getZivotinjskeVrste()[i].Ime);
                    imgList.Images.Add(Zivotinje.getInstance().getZivotinjskeVrste()[i].Ikona);
                    items.ImageIndex = i;
                    items.SelectedImageIndex = i;
                    items.Tag = Zivotinje.getInstance().getZivotinjskeVrste()[i];
                }
                tvIcon.ImageList = imgList;
            }
        }

        private void tvIcon_BeforeCollapse(object sender, TreeViewCancelEventArgs e)
        {
            e.Cancel = true;
        }

        private void tvIcon_MouseDown(object sender, MouseEventArgs e)
        {
           _draggedIndexItem = tvIcon.GetNodeAt(e.Location);

            if (_draggedIndexItem != null)
            {
                tvIcon.SelectedNode = _draggedIndexItem;
                if (_draggedIndexItem.GetNodeCount(true) == 0)
                {
                    Size dragSize = SystemInformation.DragSize;
                    _mouseDownSelectionWindow = new Rectangle(new Point(e.X - (dragSize.Width / 2), e.Y - (dragSize.Height / 2)), dragSize);
                  //  MessageBox.Show(_mouseDownSelectionWindow.ToString());
                    int idx = _draggedIndexItem.ImageIndex;
                    selImg = tvIcon.ImageList.Images[idx];
                }
                else
                {
                    _mouseDownSelectionWindow = Rectangle.Empty;
                }
            }
        }

        private void tvIcon_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if ((_mouseDownSelectionWindow != Rectangle.Empty) && (!_mouseDownSelectionWindow.Contains(e.X, e.Y)))
                {
                    _screenOffset = SystemInformation.WorkingArea.Location;
                    DragDropEffects dropEffect = this.tvIcon.DoDragDrop(_draggedIndexItem, DragDropEffects.Copy);
                }

            }
        }

        private void pMap_DragEnter(object sender, DragEventArgs e)
        {
            Type testType = new TreeNode().GetType();

            if ((e.Data.GetDataPresent(testType)))
                e.Effect = DragDropEffects.Copy;
            else
                e.Effect = DragDropEffects.None;
        }

        private void pMap_DragDrop(object sender, DragEventArgs e)
        {
            Type testType = new TreeNode().GetType();
            TreeNode draggedItem;
            _mouseDownSelectionWindow = Rectangle.Empty;

            if (e.Data.GetDataPresent(testType))
            {
                draggedItem = (TreeNode)e.Data.GetData(testType);
         //       draggedItem.ToolTipText = "Prevuceno!";
          //      draggedItem.ForeColor = Color.Gray;

                position = Cursor.Position; // Pozicija kursora na ekranu
                Point controlRelatedCoords = this.pMap.PointToClient(position); // Pozicija kursora relativna panelu...

                // Obrada:
                CustomToolTip ctt = new CustomToolTip();

                ZivotinjskeVrste zv = (ZivotinjskeVrste)draggedItem.Tag;
                PictureBox pb = new PictureBox();
                pb.Location = new Point(controlRelatedCoords.X, controlRelatedCoords.Y);
                pb.Image = selImg;
                pb.Size = new Size(selImg.Width, selImg.Height);;
                pb.BackColor = Color.Transparent;
                pb.Tag = draggedItem.Tag;
                pMap.Controls.Add(pb);
                Button btn = new Button();
                pb.Tag = pb.Image; // Hackfix of le year
                String tt = "Oznaka: " + zv.Oznaka + Environment.NewLine + "Ime: " + zv.Ime + Environment.NewLine + "Tip: " + zv.Tip + Environment.NewLine + "Status ugrozenosti: " + zv.StatusUgrozenosti + Environment.NewLine + "Opasna za ljude: " + zv.OpasnaZaLjude  + Environment.NewLine + "IUCN lista: " + zv.IUCN + Environment.NewLine + "Zivi u naseljenom mjestu: " + zv.NaseljenoMjesto + Environment.NewLine + "Turisticki status: " + zv.TuristickiStatus + Environment.NewLine + "Prihod od turizma: " + zv.Prihod + "Datum otkrivanja: " + zv.DatumOtkrivanja + Environment.NewLine + "Opis: " + zv.Opis;
                ctt.SetToolTip(pb, tt);
                // Snimanje u kolekciju!
                IkoniceKoord ik = new IkoniceKoord();
                ik.x = controlRelatedCoords.X;
                ik.y = controlRelatedCoords.Y;
                ik.icon = selImg;
                ik.tTip = tt;

                Ikonice.getInstance().getIkonice().Add(ik);
                Ikonice.getInstance().SaveFile();

            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.DialogResult = DialogResult.OK;
            this.Close();
        }
    }
}