Any Way To Import Classes In AS File?

I tried to import a class in a .as file and I had strange behaviors that I cannot explain. First of, I tried to get work a senocular class by importing it locally his script in the same directory of my main .as class.

package{
import flash.display.*;
import flash.net.*;
import flash.events.*;
import duplicateDisplayObject;

There was no error returned from the compiler saying not found but there was one telling my class is still undefined as when I try to make the class work. (possibly undefined method). So I did it with the old fashion I found in some demos, placing the .as file in a com/senocular/display/ folder:

package {
import flash.display.*;
import flash.net.*;
import flash.events.*;
import com.senocular.display.duplicateDisplayObject;

And then no errors. The compiler recognize the class and execute it.