Please refer to the following code snippet:
Dim root As New RadTreeNode()
root.Expanded = True
root.Text = "Root"
root.Name = "Root"
Me.RadTreeView1.Nodes.Add(root)
Dim telerikTreeNode = New RadTreeNode With
{
.Expanded = True,
.Name = "Child1",
.Text = "Child1",
.Tag = "test",
.Font = New Font("Arial", 12.0F, FontStyle.Regular)
}
Me.RadTreeView1.Nodes("Root").Nodes.Add(telerikTreeNode)
For index = 2 To 5
Dim child As New RadTreeNode()
child.Text = "Child" & index
Me.RadTreeView1.Nodes("Root").Nodes.Add(child)
Next