understand XFM Feature in VBA

Hi,
I'm trying to understand XFM in VBA but I have a little problem. I would like to change the property of a Feature and I do not know how. If I do so:

Sub XLS2XFM()
Dim ee As ElementEnumerator
Dim esc As New ElementScanCriteria
Dim att As Attachment
Dim oFeature As xft.feature
Dim RootFeature As xft.IFeature
Dim oLocateOp As New locateOp
Dim tempDane As String
Set ee = ActiveModelReference.Scan()

Do While ee.MoveNext
if ee.curent.isgraphical then
     Set oFeature = xft.FeatureMgr.CreateFeature(ee.Current)
tempDane = oFeature.GetProperty("No1")
 oFeature.SetProperty "No1", arrExcel(i, 1)
End If
Loop
End Sub

 I created a new Feature. How to change a property of the existing element / Feature.

regards
adrian