actionscript 3 - Can't move object of class in AS3 -

i'm making game in need hero shoot, can't realize why bullets aren't moving. appear on stage stay in place appear , don't move. can't find mistake. thanks!!

so class has make appear , move bullets when press space.

public class nivel_1 {     public var mc:mainchar = new mainchar();     public var ene:enemigo = new enemigo();     public var bullet:bullet = new bullet();      public var back:mc_nivel_1 = new mc_nivel_1()      public var spawn_boss:boolean =false;     public var boss:boss = new boss();      public static var balavector:vector.<bullet> = new vector.<bullet>();      public var disparo:boolean = false;       public function nivel_1()     {        }      public function iniciar():void     {         main.escenario.addeventlistener(event.enter_frame, update);         main.escenario.addchild(back);         ene.init(600,630);         mc.init(100,150);          main.escenario.addeventlistener(keyboardevent.key_up, onkeyuplv1);         main.escenario.addeventlistener(keyboardevent.key_down, onkeydownlv1);          trace ("start");     }      public function update(e:event = null):void     {         updatebala();         mc.update();         coliciones();          if(spawn_boss)         {             boss.update();         }     }      public function onkeyuplv1(e:keyboardevent):void     {         switch (e.keycode)         {             case keyboard.space:                 disparo = true;                 if (disparo == true)                  {                     var bala:bullet = new bullet();                     bala.inicializar(mc.grafica.x, mc.grafica.y - mc.grafica.height/2 , mc.grafica.scalex);                 }                 break;         }     }      public function onkeydownlv1(e:keyboardevent):void     {         switch (e.keycode)         {             case keyboard.space:                 disparo = false;                 break;         }     }      public function coliciones():void     {         for(var i:int = 0; < balavector.length ;i++)         {                            if(balavector[i].grafica_1.hittestobject(ene.grafica))             {                 ene.destroy();                 balavector[i].destruir();                 boss.init(600,650);                 spawn_boss = true;                 break;             }              if(balavector[i].grafica_1.hittestobject(boss.grafica))             {                 boss.destroy();                 balavector[i].destruir();                 break;             }         }          if(mc.grafica.hittestobject(ene.grafica))             {                 mc.grafica.x = mc.grafica.x - 3;                 mc.vida --;             }          if(mc.grafica.hittestobject(boss.grafica))             {                 mc.vida -5;             }     }      public function updatebala():void     {         for(var i:int=0;i<balavector.length;i++)         {             balavector[i].bulletupdate();         }     }      public function endgame():void     {         mc.destroy();         main.escenario.removeeventlistener(event.enter_frame,update);     } } 

and class of bullets.

public class bullet {     public var grafica_1:mc_bala_1;     public var velocidad_1:int = 15;     public var damage_1:int = 1;     public var direccion:int = 0;      public function bullet()     {     }      public function bulletupdate():void     {         mover();     }      public function inicializar(posx:int , posy:int , dir:int):void     {         grafica_1 = new mc_bala_1();         grafica_1.x = posx;         grafica_1.y = posy;         this.direccion = dir;         game.balavector.push(this);         main.escenario.addchild(grafica_1);          trace ("bala");     }      public function mover():void     {         grafica_1.x += velocidad_1 * direccion;          if (grafica_1.x < 0 || grafica_1.x > main.escenario.stagewidth)         {             destruir();         }     }      public function destruir():void      {         if (main.escenario.contains(grafica_1)) main.escenario.removechild(grafica_1);         game.balavector.splice(game.balavector.indexof(this),1);          trace ("destruir bala");     }    } 

your multiplying velocity * direction, 15*0 = 0, why not moving