I searched inline (docs), local, in the Documentation folder (hard disk), but I do not found any explanation on ow to use ComboBox.AutoComplete.
My attention was kicked by this forum.
Basically what you do is to populate the InitialValue with the various text list and when your user types into the combobox one or more characters, the closest match will auto completed in the combobox.
Thank you Edwin for the tip. I will try it later today !