[2005] Losing ToolStrip Navigating Buttons

[pierrewhy]

I'm using my PK to fetch a record and display it on my form.

PropertyBindingSource.Filter = "HouseNumber = '" + housenumber + "'"

Everything works fine but my ToolStrip Navigating Button are not activated and I cannot navigate to a record previous or next from the one showing on the screen.
Is there a way to get a record number for that record and insert that number in the ToolStrip PositionItem box? Or using something else than Filter?
Thanks,
Pierre