override & different packages?

Hello.

I've having a problem overriding a method while extending a class whose parent class resides in another package.

My desire is to create a subclass based on the super class Calendar, but located in another package.

Unfortunately I'm only able to override the 'dosomething' method if I make it public [inside Class] or putting ExtendedCalendar in the same folder as Calendar [wich I dont want to...]. Any thoughts?

package utils1 {

public class Calendar {

public function Calendar(){
dosomething();
}

internal function dosomething():void {
. . .
}
}
}

//this will give me the following error:
//"1020: Method marked override must override another method."

package utils2 {

import utils1.Calendar;

public class ExtendedCalendar extends Calendar {

public function ExtendedCalendar (){
super();
}

override internal function dosomething():void {
. . .
}
}
}

Thanks in advance,
T.