Hello Dieter,

You can get the subitem of NTreeList when the user click on it by the following way:

nTreeList1.MouseUp += new MouseEventHandler(nTreeList1_MouseUp);

...

void nTreeList1_MouseUp(object sender, MouseEventArgs e)

{

    NTreeListNode node = (NTreeListNode)nTreeList1.ItemFromPoint(new NPoint(e.Location));

    for (int i = 0; i < node.SubItems.Count; i++)

    {

        Rectangle r = node.SubItems[i].ViewBounds.ToRectangle();

        if (r.Contains(e.Location))

        {

            subItem = node.SubItems[i];

            return;

        }

    }

}

Regards,

Angel.