Here you are:
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
De nada...