AutoCAD .NET :: Insert New Instance Of Already Defined XRef

I'm trying to insert a new instance of a X-Ref already present on the drawing. If i use Database.AttachXref(path, name) I receive "ref NAME has already been defined. Using existing definition."  on the command bar. I've tried to retrieve the ObjectId of the X-Ref definition from the X-Ref name, but my code don't work. Where is the error?

Here's my

Private Sub AttachXRef(path As String, name As String)
Dim Doc As Document = Application.DocumentManager.MdiActiveDocument
Dim Db As Database = Doc.Database Dim pPtRes As PromptPointResult
Dim pPtOpts As PromptPointOptions = New PromptPointOptions("")

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