ActionScript 2.0 :: Flash Cannot Create Extended MovieClip

Why Flash creates regular MovieClip object, not instance of extending class? So, I've written a class "test" and put it into "n/test.as" file (as shown on the first attachment).
Code:
class test extends MovieClip {
private var flag:int;
public function test() {
trace('!!mover constructor!!');
flag = 56;
} public function Method():Void {
trace('in methdo');
}}

Then I've created symbol in the library, specified it's name and linkage identifier (as shown on the last attachment). Then I've put following code to the first frame:
Code:
import n.*;
var r = this.attachMovie('test', 'test_mc', getNextHighestDepth(), {_x: 40, _y: 0});
trace('ret ' +r);
trace(test_mc.flag);
trace(typeof test_mc.Method);
program_mc.Method();
And I see in output panel that test class property flag and method Method are undefined for test_mc.