Ok. Thank you but,

My Requirement is appending textboxes to the UltraTreeView nodes like..

- [CheckBox] [Node1Name] [TextBox1]

           - [CheckBox][ChildNode1Name] [TextBox2]

           - [CheckBox][ChildNode2Name] [TextBox3]

- [CheckBox] [Node2Name] [TextBox4]

Please Give Me the Solution for dis asap..

Here's some very simple sample code to get you started. Setting up the ColumnSet would be easier to do at design-time - least for the structure if not the editors. You also might want to use the OutlookExpress ViewStyle instead of grid, depending on your application. This also might easier if you create a data source and bound it to the tree instead of creating everything manually. But there's not enough information in your post for me to guess every need of your application.

        private void Form1_Load(object sender, EventArgs e)
        {
            this.ultraTree1.Override.CellClickAction = CellClickAction.EditCell;
            this.ultraTree1.Override.LabelEdit = Infragistics.Win.DefaultableBoolean.True;            

            this.ultraTree1.ViewStyle = Infragistics.Win.UltraWinTree.ViewStyle.Grid;
            UltraTreeColumnSet myColumnSet = this.ultraTree1.ColumnSettings.ColumnSets.Add("My ColumnSet");
            myColumnSet.AllowCellEdit = AllowCellEdit.Full;

            UltraTreeNodeColumn column;
            
            column = myColumnSet.Columns.Add("CheckBox");
            CheckEditor checkEditor = new CheckEditor();
            checkEditor.CheckAlign = ContentAlignment.MiddleCenter;
            column.Editor = checkEditor;
            column.DataType = typeof(bool);

            column = myColumnSet.Columns.Add("NodeName");
            column.DataType = typeof(string);

            column = myColumnSet.Columns.Add("TextBox");
            column.DataType = typeof(string);

            this.ultraTree1.Override.ColumnSet = myColumnSet;


            for (int i = 0; i < 3; i++)
            {
                UltraTreeNode node = this.ultraTree1.Nodes.Add();
                for (int j = 0; j < 3; j++)
                {
                    node.Nodes.Add();
                }
            }            
        }