Cross-thread operation not valid: Control

I am trying to load a combo box from a web service.  I am doing this through a callback Display lists.  Display lists receives the Lists parameter fine when called. So the web service call itself is working fine.   But when i tries to bind the list to the combo box i get the error  "Cross-thread operation not valid: Control '' accessed from a thread other than the thread it was created on."  

I have tried re-factoring this in many ways using background workers etc I even tried to create my own custom control who sole purpose was to load this data.  All methods seem to give me the same error.




 

Private WithEvents M_List As New IContact.List

  
Private Sub ctrl_ImportGroups_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Me.M_List.LoadLists()
End Sub



Public Sub DisplayLists(ByVal Lists As List(Of IContact.List)) Handles M_List.onLoadListsCompleted
        Me.cmbIContactList.DataSource = Lists
        Me.cmbIContactList.ValueMember = "listid"
        Me.cmbIContactList.DisplayMember = "name"
End Sub

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