need a little macro help - search inside groups

hi there.  I have this code to search for a remove the lens effects for objects on a page but I want it to dig into groups but I'm not sure how to do this?  Any help is appreciated.

Private Sub CommandButton1_Click()
 Dim s As Shape
 For Each s In ActivePage.Shapes
  If s.Transparency.Type <> cdrNoTransparency Then
   s.Transparency.ApplyNoTransparency
  End If
 Next s

End Sub