Public member not found.

Hello.

I was trying to use vb.net instead of VBA in VisualStudio. My code lock like this:

Imports CorelDRAW
Imports VGCore

Public Class Form1
    Dim cdr As CorelDRAW.Application = New Application()
    Private Sub btnOk_Click(sender As Object, e As EventArgs) Handles btnOk.Click
        cdr.ActiveDocument.Unit = cdr.cdrMillimeter
        Dim u As String
        u = cdr.ActiveDocument.WorldScale
' ....
End Sub
End Class

When i run it I get an error: Public member 'cdrMillimeter' on type 'ApplicationClass' not found.

Any ideas?
Thank you