BUG in V7 with "Microsoft Web Browser" control

1/ I have a SubForm with “Microsoft Web Browser” control :

Sub Postopen(Source As Notesuidocument)

Dim db As NotesDatabase

Dim url As String

Dim navig_handle 			As Variant

Dim url2 As String



Set db = source.Document.ParentDatabase

url2="http://xxx.xxx.xxx.xxx/"+db.FilePath+"/"

url = "http://xxx.xxx.xxx.xxx/"+db.FilePath+"/Flex_Reclam?OpenPage&unid="+source.FieldGetText("JavaUNID")+"&filtre="+source.FieldGetText("filtre")+"&doc="+source.Document.form(0) + "&url=" + url2

Set navig_handle = Source.GetObject( "Microsoft Web Browser" )



navig_handle.Navigate(url)

End Sub

2/ I have a form “A” (with the subform)

3/ I have a second Form “B” (with the subform) which is a response to “A”

4/ i create à document “A” the document is open when i create the response “B”. If i close “B” i have a RED screen.

Any idéa ?