AS3 duplicated MovieClip - actionscript-3

Question

In my app I'm importing movieclips from library to the stage like this :
package {
import flash.display.*;
import flash.text.*;
import flash.events.*;
import flash.ui.Keyboard;
import flash.ui.Mouse;
import flash.display.MovieClip;
public class MainTimeline extends MovieClip {
//Variabili
public var VFullscreen: int = 1;
//Import var
public var VTerminal: Terminal = new Terminal();
public var nTerminal:String;
public function MainTimeline(): void {
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
//Import
//Terminal
VTerminal.x = 288;
VTerminal.y = 384;
stage.addChild(VTerminal);
//Event Listeners
//addEventListener(MouseEvent.CLICK, fl_BringToFront);
VTerminal.addEventListener(MouseEvent.MOUSE_DOWN, fl_WindowDrag);
VTerminal.addEventListener(MouseEvent.MOUSE_UP, fl_WindowDrop);
}
//public functions
//Gestione Fullscreen
public function fl_Fullscreen(event: MouseEvent): void {
switch (VFullscreen) {
case 0:
stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE;
VFullscreen = 1;
break;
case 1:
stage.displayState = StageDisplayState.NORMAL;
VFullscreen = 0;
break;
}
}
public function fl_FSCheck(event: Event): void {
if (stage.displayState == StageDisplayState.NORMAL) {
VFullscreen = 0;
}
if (stage.displayState == StageDisplayState.FULL_SCREEN_INTERACTIVE) {
VFullscreen = 1;
}
}
//Primo Piano Finestre
public function fl_BringToFront(event: MouseEvent): void {
this.addChild(event.currentTarget as DisplayObject);
}
public function fl_WindowDrag(event: MouseEvent): void {
event.currentTarget.startDrag();
nTerminal = event.currentTarget.name.toString();
trace(nTerminal);
}
public function fl_WindowDrop(event: MouseEvent): void {
event.currentTarget.stopDrag();
}
//Chiusura
public function fl_Close(event: MouseEvent): void {
stage.nativeWindow.close();
}
//Apertura/Chiusura Terminal
public function fl_Terminal(event: MouseEvent): void {
if (contains(VTerminal)) {
removeChild(VTerminal);
} else {
VTerminal.x = 288;
VTerminal.y = 320;
addChild(VTerminal);
}
}
}
}
But I've a strange bug that I've never seen. It had the same MC twice and, in the runtime, when i drag and drop it I can see 2 MC one named instance8 and one instance45. I don't know how to solve this.
Thanks in advance.
TERMINAL CLASS
package {
import flash.display.MovieClip;
import flash.events.*;
import flash.ui.Keyboard;
import flash.text.TextField;
public class Terminal extends MovieClip {
public var version: String = "Verison 0.0.1 a";
public function Terminal(event: Event) {
//Varie
nome.text = "terminal";
vOut.text = version;
//Animazioni
loader0.gotoAndPlay(1);
loader1.gotoAndPlay(25);
}
}
}

Answer 1

As far as I can see, the statement
//Primo Piano Finestre
public function fl_BringToFront(event: MouseEvent): void {
this.addChild(event.currentTarget as DisplayObject);
}
when the mouseDown and mouseUp event finished, the mouseEvent.click event will trigger, so you will get another instance