Hi,

I need to use BindingList as DataSource for UltraWinTree. So I have created form with UltraWinTree and wrote some code for filling BindingList to get nested nodes (see pic1. below). Node with "1.2" caption has several nested childs marked from "0" to "9". But when I try to open "0" node, I get the exception: "A first chance exception of type 'System.MissingMethodException' occurred in mscorlib.dll. Additional information: Constructor on type 'MyUltra.ISomeNode' not found."  But if I remove source code line which adds node "1.1" everything works fine (see pic2). Why does it happen? Please, see my code below.

Thanks in advance.

pic1

pic2

public interface ISomeNode
    {
        string Name { get; set; }
        BindingList< ISomeNode > Childs { get; set; }
    }

    public class SomeNode : ISomeNode
    {
        private readonly BindingList< ISomeNode > _list
            = new BindingList< ISomeNode >();

        public string Name { get; set; }

        public BindingList< ISomeNode > Childs
        {
            get { return _list; }
            set {}
        }
    }

        private void Form1_Load(object sender, EventArgs e)
        {
            ultraTree1.ViewStyle = ViewStyle.Standard;
            BindingList<SomeNode> ds = new BindingList<SomeNode>();
           
            SomeNode root = new SomeNode() { Name = "1" };
            ds.Add( root );

            SomeNode r1_1 = new SomeNode() { Name = "1.1" };
            SomeNode r1_2 = new SomeNode() { Name = "1.2" };
            root.Childs.Add( r1_1 ); // Remove this and everything works fine
            root.Childs.Add( r1_2 );

            SomeNode node = r1_2;
            for( int i = 0; i < 10; i++ )
            {
                node = PutNode( node, i );
            }

            ultraTree1.SetDataBinding(ds, null);
        }

        private SomeNode PutNode( SomeNode node, int numero )
        {
            SomeNode child = new SomeNode();
            child.Name = string.Format( "{0}", numero );

            node.Childs.Add( child );
            return child;
        }