[AS3]hitTestPoint problem

Hello there.
I have a problem with hitTestPoint in my class file.
If i use this line “circle.circleknife.knife.hitTestPoint(enemy.x, enemy.y)” in my main timeline code, works without a problem.
But if i use this “_r.circle.circleknife.knife.hitTestPoint(this.x, this.y)” which is the same thing basicly, it wont work. If i hit CTRL-ENTER and my knife touches the enemy, nothing happens, not even an error or something.
The “_r” comes from display object root so i can use objects from class files.

PS: The “hitTestObject” works on both class file and main timeline no problem.