enumerate CodeElements of function

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VB11

Hello guys help for a beginner.
How to enumerate CodeElement inside the body of a function?
thank you
I want to try to write an addin that can write a Select Case of an enumerated variable inside a function.
I tried with this code with Visual Studio 2010 :

Imports EnvDTE
  Imports EnvDTE80
  Imports System.Collections.Generic
  Imports System.Text
  Public Class Form1
    Private dte As DTE2 = System.Runtime.InteropServices.Marshal.GetActiveObject("VisualStudio.DTE.10.0")
    Dim lElements As New List(Of String)
    Public Enum Sizes
      Small
      Medium
      Large
      ExtraLarge
    End Enum
    Private Sub Test(mysize As Sizes)
      Dim prova As Sizes        'not found in FileCodeModel
      prova = Sizes.ExtraLarge   'not found in FileCodeModel
    End Sub
    Private Sub RecursiveLoop(cdElements As CodeElements)
      Dim children As String
      Dim elem As CodeElement
      Try
        For Each elem In cdElements
          lElements.Add(elem.Name & vbCrLf)
          RecursiveLoop(elem.Children)
        Next
      Catch ex As Exception
        System.Windows.Forms.MessageBox.Show(ex.ToString)
      End Try
    End Sub
    Sub CodeElementsExample(ByVal dte As DTE2)
      Dim fcm As FileCodeModel = _
            dte.ActiveDocument.ProjectItem.FileCodeModel
      RecursiveLoop(fcm.CodeElements)
      Dim sBuilder As New StringBuilder
      For Each item As String In lElements
        sBuilder.Append(item)
      Next
      MsgBox(sBuilder.ToString)
    End Sub
    Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
      Stop   ' open code window
      CodeElementsExample(dte)
    End Sub
  End Class