When you add a new node in self-referencing hierarchy, several nodes are added on random levels. In addition, if you remove an existing node, a NullReferenceException is thrown.
test project:
using System.Data;
using System.Windows.Forms;
using Telerik.WinControls.UI;
namespace Lab.Tree
{
public partial class TreeSelfReferenceAddFrom : Form
{
private RadTreeView treeView = new RadTreeView();
public TreeSelfReferenceAddFrom()
{
InitializeComponent();
treeView.Dock = DockStyle.Fill;
treeView.Parent = this;
treeView.AllowDefaultContextMenu = true;
treeView.AllowAdd = true;
treeView.AllowEdit = true;
treeView.AllowDrop = true;
treeView.AllowDragDrop = true;
treeView.AllowRemove = true;
DataTable table = new DataTable();
table.Columns.Add("ID");
table.Columns.Add("ParentID");
table.Columns.Add("Name");
table.Rows.Add(1, 0, "Name1");
table.Rows.Add(2, 0, "Name2");
table.Rows.Add(3, 0, "Name3");
table.Rows.Add(4, 1, "Name5");
table.Rows.Add(5, 1, "Name6");
table.Rows.Add(6, 3, "Name6");
treeView.DisplayMember = "Name";
treeView.ChildMember = "ID";
treeView.ParentMember = "ParentID";
treeView.DataSource = table;
}
}
}

When the RadTreeView is not in full row select mode, the selected node crops its text.

The XML serialization of RadTreeNode does not serialize its Font and ForeColor properties. The XML deserialization does not create a checked nodes from xml file that contains serialized checked nodes.

If the RadTreeView does not have node, the Property Builder is closed when the Color Selector button is clicked.

The AllowDrop property of RadTreeNode allows dropping of node when its value is false.

If the DPI configuration has 120% value, Save, Close and Cancel buttons disappear from the Property Builder form.

When the ShowLines property is enabled and load on demand hierarchy is uses, the node link lines are not rendered properly.

When you press the right mouse button twice the pointed node is expanded.

When the RadTreeView is in edit mode, the top or bottom border of the editor is missing.

The selection should not be cleared, when you start drag operation from any of the selected nodes in multi-selection.

When a tree is bound using object-relational binding the editing does not work for nodes that are on level higher than the first.

Font settings for particular node made by Property Builder are washed up if the Property Builder is opened again.

Some nodes do not auto-expand when hovered while dragging nodes.

When self reference data binding is in place, editing a root node throws a null reference exception.

The built-in drag-and-drop mechanism in RadTreeView should be revisited. Currently some events are not raised properly under certain conditions.

Sometimes, e.Node and e.TargetNode are null in the DragEnded event handler

Nodes are not always dropped successfully on another treeview when the source nodes are selected.

Create a new project and add RadTreeView
Handle the Click event
Call the Close method of the Form when handling the Click event

1. navigate to some tree item, try to right-click it to see context menu. It is working ok
2. have the focus on tree item, and having the mouse over that item, try to press context keyboard button