/// <summary>
        /// 마우스 키를 눌렀을 때
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void wTree_MouseDown(object sender, MouseEventArgs e)
        {
            Point     pt;
            wTreeNode selectedNode = GetNodeFromPoint(e.Location, out pt);
            //int index = 0;
            wTreeNodeItemMouseArgs args = new wTreeNodeItemMouseArgs(new MouseEventArgs(e.Button, e.Clicks, pt.X, pt.Y, e.Delta));
            wTreeNodeItem          item = (selectedNode == null) ? null : selectedNode.GetItemFromPoint(pt);

            if (E_TreeNodeMouseDown != null)
            {
                E_TreeNodeMouseDown(selectedNode, item, args);
            }
            if (args.IsCanceled)
            {
                return;
            }

            _pressedNode = selectedNode;
            _pressedItem = item;
            if (_pressedItem != null && _pressedItem.ItemType == wTreeNodeItemTypes.CheckBox)
            {
            }
            else
            {
                if ((ModifierKeys & Keys.Control) != Keys.Control)//Control을 안눌렀다면 이전의 선택부분을 모두 지움..
                {
                    if ((ModifierKeys & Keys.Shift) == Keys.Shift)
                    {
                        if (_isShiftDown)//이전에 shift를 누른 채 떼지 않았다면..
                        {
                            //_pressedNode = _lastMouseUp;//이전에 클릭했던 지점부터 시작..

                            //SelectedNode = _lastMouseUp;
                            int tempSelecting = VisibleNodes.IndexOf(selectedNode);
                            SelectionHandler.drawSelectingNodes(VisibleNodes.IndexOf(_lastMouseUpNode), tempSelecting);
                            _isShiftDown = true;
                        }
                        else
                        {
                            SelectionHandler.ClearAllSelections();

                            //_pressedNode = _lastMouseUp;//이전에 클릭했던 지점부터 시작..

                            //SelectedNode = _lastMouseUp;
                            int tempSelectingStart = VisibleNodes.IndexOf(_lastMouseUpNode);
                            int tempSelecting      = VisibleNodes.IndexOf(selectedNode);
                            SelectionHandler.drawSelectingNodes(tempSelectingStart, tempSelecting);
                            _isShiftDown = true;
                        }
                        DrawHandler.ReDrawTree(false);
                    }
                    else
                    {
                        SelectionHandler.ClearAllSelections();

                        //SetNodeSelected(selectedNode, pt);
                        DrawHandler.ReDrawTree(false);
                    }

                    //this.Focus();
                }
            }
            if (EditorHandler.ActivatedEditor != null || _ownerTree.Focused == false)
            {
                ReleaseFocus();
            }
        }