ImageIndex?

[Pc_Not_Mac]

Hello, How would i only put a image to the sub-parent, and not the parent it self?
Below a made a code which adds image by node.ImageIndex = 0, and then attempts to remove it by node.ImageIndex = Nothing.
I thought by assign the value to Nothing will work?

 TreeView1.CheckBoxes = True
        TreeView1.ImageList = ImageList1
        Dim node As TreeNode
        Dim x As Integer
        For x = 0 To 1
            node = TreeView1.Nodes.Add("1")
            node.ImageIndex = 0
            Dim y As Integer
            For y = 1 To 4
                node = node.Nodes.Add("Test")
                node.ImageIndex = Nothing
            Next
        Next

[Pc_Not_Mac]

Is my question that difficult?

[Pc_Not_Mac]