Actually, here is the problem discussed, may give you some ideas:
Little problem with AddAll/AddBlank Thread #
1142413 >Hello,
>
>I have a combo setup like the following (column2 descriptions removed for clarity):
>this.RowSourceType = 1
>this.ColumnCount = 2
>this.BoundColumn = 1
>this.ColumnLines = .F.
>this.RowSource = "0,,1,,2,,3,,4,,5,"
>this.BoundTo = .T.
>
>What I need is to have .NULL. as an item in the rowsource, so that when that item is selected, the null value gets put back into the controlsource.
>E.g. this.RowSource = ".NULL.,,0,,1,,2,,3,,4,,5,"
>
>Can this be done?
If it's not broken, fix it until it is.
My Blog 
