Thank you very much for your answer.
The problem is also here, but no solution:
I have in total three websites, same name, but different code.
1. Mywebsite, code: base, sort order: 0, set as default (assigned to mydomain.us)
2. Mywebsite, code: base, sort order: 1
3. Mywebsite, code: espanya, sort order: 2 (assigned to mydomain.es)
Then I have three stores, as the first one has two languages.
1. USA Store, website: Mywebsite
2. USA Store, website: Mywebsite
3. Spain Store, website: Mywebsite (code: espanya)
Then, three store view name:
1. English, store: USA Store, code: en
2. Spanish, store: USA Store, code: es
3. Spanish, store: Spain Store, code: esp_es
Please notice that website codes are different, because in second domain, *.es, the index.php file has this line:
I have done this following the instructions, but no dropdown is visible. :-(
Can somebody point me where is the problem please? Your help is really appreciated in advance. Best regards.