It does not make sense to me that you could search on a field that really does not appear in the db table and it does not seem to show up as one of the output fields in the browsedialog.

    Private Sub ComboBox1_ListPopulating(ByVal e As MicroFour.StrataFrame.UI.ListPopulatingEventArgs) Handles ComboBox1.ListPopulating
        '-- pass your parameters
        e.Parameters(0).Value = True
        e.Parameters(1).Value = "My Second Parameter"
        e.Parameters(2).Value = "And Yet Another Parameter"
    End Sub