>>But modifying the rowsource is easy.
>
>That's the easy bit, unfortunately the design of the application makes that not a real option - the array is used in multiple places on the same form & it would be inappropriate to modify the array until after the changes are confirmed, so big changes would be required.
>
>One option may be to add an array member to the combobox class & work on a copy of the array for place the array is used. Would that be possible through the class designer, or would that require manual coding of the class ?

Class designer is capable of the task. However you might just use a copy of array on form too.

with thisform
.Addproperty('NewArray['+trans(alen(.myArray))+']','')
acopy(.myArray,.NewArray)
.myCombo.rowsource = 'thisform.NewArray'
endwith

Cetin