Overriding implicit setter method with a trait

Hi guys, I'm a kinda experienced Java developer, now trying to learn
Scala. I'm having issues overriding an implicit setter, you may want
to check my post at StackOverflow:

http://stackoverflow.com/questions/8281562/overriding-implicit-setter-me...

Do you know why the compiler is giving me an error? Am I doing
something wrong or it's just a limitation of the Scala language?

Help in advance,

Ivan