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The big problem is when the table has many rows, how to show it and make it fast

I found data for countries and cities of the world, 250 countries and 94000 cities, I think it is good for example

Download, unzip, then build demo.prg

I know the example is simple, if you have time take a look and write a comment so it could be better

Hola Dragan :
yo use en mi POS (point of sale) la identificacion GS1 de cada pais para ubicar de que pais pertenece ese producto con el prefijo y asi poder mostrar su origen con un icono de la bandera del pais... nose como concatenar las cuidades a esos paises .

When the number or rows/records are huge, use VirtualGrid.

Virtual grid is a great solution!

Os recomiendo este ejemplo, puede ayudar a muchos

Virtual GRID works with arrays or only with DBF?
I seldom work with DBF: always MySQL.

Serge