Hi - the tutorial was created for version 4.0, so in 4.1 you will need to create the form manually, because in 4.1 there are no longer templates for UI components (you can use Visual Designer for the whole UI work).
Anyway to do so, just create a new
Java Class and then make it to extend Form class using "extends Form" declaration. You will need to change the call to the super class constructor as well, since it does not have a default one (see javadoc for details).
The same thing you will need to repeat with CurrenciesSelector class, which should extend List (further in the tutorial).
Hope it helps.