Andrus,

>VFP ignores readonly property of combobox control if its style is 2 – Drop-down List.

See PRB: ComboBox ReadOnly Property Applies Only to Dropdown Combo mskb #Q156510

>I tried to fix this by adding a property readonlyemu and using the following code in the combobox interactivechange event:
>
>IF this.readonlyemu
> nodefault
> return
> endif
>
>However, this allows user to change value from keyboard or
>select other value from list. New value appears in the combobox.
>
>How to prevent entering new values ?
>Which is the best way to mark list box read only from VFP code ?

You can add lReadonly property to your combobox class and put following code in the combobox WHEN()

* WHEN()
RETURN NOT THIS.lReadonly