The euro currency symbol is not generated when you press AltGr+E in the UTF-8 locale.
Workaround: Perform the following steps to enter the euro currency symbol in the UTF-8 locale:
Select Lookup in the UTF-8 Input Mode Selection window.
Select Currency Symbols.
Select the Euro symbol.
In the Greek locale type, dumpcs at the console prompt. Then copy and paste the euro currency symbol.