Me.ultraTree1.Nodes(0).Nodes(1).Enabled = False
This topic shows you how you can disable a node in WinTree™. The Enabled property of the UltraTreeNode object must be set to false.
In Visual Basic:
Me.ultraTree1.Nodes(0).Nodes(1).Enabled = False
In C#:
this.ultraTree1.Nodes[0].Nodes[1].Enabled = false;
The following screenshot shows a WinTree with a disabled child node (Printers).