inverse kinematic problems - actionscript-3

Question

I have a problem with inverse kinematic. I'm not able to move a tentacle and I don't know why. I implemented many simple skeletons and succeed, but in this case there must be something I'm missing. Hope you can help me!
Here you have a detailed explanation:
1.- This image displays the tentacle I want to move.
*"Flup" is a MovieClip containing both the tentacle and the circle below.
*The tentacle itself is another MovieClip (inside "Flup" as said before)
*The tentacle owns an armature
image
I just want to create a simple movement to start so, in this case, I will only try to move the blue bone.
2.- Flup is a class, so I create an instance in one frame
import IllGame.enemy.boss.*;
stage.addEventListener(MouseEvent.CLICK,moveTentacle);
//Creation of the monster and insertion into stage
var flup:Flup=new Flup();
flup.x=300;
flup.y=200;
stage.addChild(flup);
//Moves the tentacle (in this case the blue bone)
//to the click point
function moveTentacle(e:MouseEvent):void{
flup.moveArmature(mouseX,mouseY);
}
3.- Flup class, very simple at this moment
package IllGame.enemy.boss{
import flash.display.MovieClip;
public class Flup extends MovieClip{
public function Flup(){
}
//Recives the coordinates of the click point
//"TentacleOne" is the instance name of the tentacle
public function moveArmature(x:Number,y:Number){
this.tentacleOne.moves(x,y);
}
}
}
4.- Next, we have the tentacle class. This class is the father of every single tentacle Flup will have, so it's the father of "TentacleOne"
package IllGame.enemy.boss{
import flash.geom.Point;
import flash.display.MovieClip;
import fl.ik.*;
public class Tentacle extends MovieClip{
//Variables needed for inverse quinematic
private var armature:IKArmature;
private var bone:IKBone;
private var joint:IKJoint;
private var point:Point;
private var movement:IKMover;
private var armatureName:String;
private var bonesName:String;
private var bonesNumber:int;
public function Tentacle(armatureName:String,bonesName:String,bonesNumber:int){
this.armatureName=armatureName;
this.bonesName=bonesName;
this.bonesNumber=bonesNumber;
armature=IKManager.getArmatureByName(armatureName);
}
//This function is supposed to move the 7º bone (the blue one)
public function moves(x:Number,y:Number){
bone=armature.getBoneByName(bonesName+"7");
joint=bone.headJoint;
movement=new IKMover(joint,joint.position);
movement.moveTo(new Point(x,y));
}
}
}
5.- Finally, TentacleOne class, which only sends information to its father
package IllGame.enemy.boss
{
public class FlupTentacleOne extends Tentacle{
const NUM_BONES:int=7;
public function FlupTentacleOne(){
super("Armature_20","ikBoneName",NUM_BONES);
}
}
}
I'm sorry for the long post, but I'm really annoyed about this and have no clue where the problem is. Thanks to everyone that tries to help me.
PS: When I run this code, X and Y vars for the skeleton position are modified but visually the armature keeps static.