Tree in a datagrid

I used DevExpress.XtraTreeList.TreeList component to show tree structured DB table on a form. It was so easy.

create table treesamp (
nodeid number(5),
parentnodeid number(5),
datatext varchar2(50)
);

Sample table data:
1 0 "Root"
2 1 "Leaf 1"
3 1 "Leaf 2"
4 2 "Leaf 1 of Leaf 1"
5 2 "Leaf 2 of Leaf 1"
6 3 "Leaf 1 of Leaf 2"
7 3 "Leaf 2 of Leaf 2"
8 4 "Leaf 1 of Leaf 1 of Leaf 1"
...

Place your TreeList on a form and just set following values:

treelist1.DataSource= treeDataTable;
treelist1.KeyFieldName= "nodeid";
treelist1.ParentFieldName= "parentid";
treelist1.PreviewFieldName= "datatext";
RootValue= 0; // if id of parent is zero, it must be root node

To print the tree treeList1.ShowPrintPreview();
It prints it in XtraReport Preview, the same as in form grid.