Free or open source Tree-grid for C#? [closed]

Question

Is there any Tree-Grid component that is freely available for a C# project? A Tree-grid is a combination of a tree view and a datagrid. Every tree item represents a row in a table. Like this:

Answer 1

ObjectListView is great:

_{(source: sourceforge.net)}

Answer 2

This one isn't bad : http://www.codeproject.com/KB/tree/TreeWithColumns.aspx

The best one I used is DevExpress's XtraTreeList, but it's not free...