Ho risolto cosi
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For i As Integer = 1 To iDriveCount
Dim iNodo As New System.Windows.Forms.TreeNode()
iNodo.ImageIndex = 0
iNodo.SelectedImageIndex = 0
iNodo.Text = strDrive.Item(i)
trvDirectory.Nodes.Add(iNodo)
iNodo.Nodes.Add("")
iNodo.Clone()
Next
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Che ve ne pare??