private void addNode_Click(object sender, EventArgs e) { if (treeViewAdv1.SelectedNode != null) { DataRowNode n = treeViewAdv1.SelectedNode.Tag as DataRowNode; if (!Convert.ToBoolean(n.Row["IsFolder"])) { return; } TreePath parent = treeViewAdv1.GetPath(treeViewAdv1.SelectedNode); m_dataTableModel.AddChild(parent, "Hi " + DateTime.Today.ToShortDateString()); } }