>>Add() have eBefore, eAfter parameters
>
>Yes, so my question was: can I use TabOrder and eBefore?

You can,
but you have to define the key like:
ContainerName+ltrim(str(member.TabOrder))

 ADD(,ContainerName+ltrim(str(member.TabOrder));
     ,ContainerName+ltrim(str(member.TabOrder+1))

BUT the VFP collection design have not a SET NEAR setting,
then eBefore must to exist.
Then TabOrder must to be collected in order
and without holes.
And then ... :((((