Thank you all for your answers !

I just wondered I miss something important and my scheme should work by default. And as it doesn't work this way I made it work myself. I put the following code to OpenTables method:

DoDefault()
Select MyAlias
Goto MyRecNo
NoDefault

and set AutoOpenTables property = .t. Since then it works correctly.
May be this could help someone else who will face such problem too.