1119: Access of possibly undefined property tabEnabled through a reference with static type flash.display:DisplayObject.

public var zzz:SecondClass;

zzz = new SecondClass(root);

addChild(zzz);

private var roots:DisplayObject;

...

public function SecondClass(root_ref:DisplayObject):void

{

   roots = root_ref;

   roots.tabEnabled = false;

}

up_btn.addEventListener(FocusEvent.FOCUS_IN, lockTab);//up_btn первой получает фокус

...

private function lockTab(e:FocusEvent):void

        {

                up_btn.tabIndex ++;

        }

var button0:Sprite = drawSprite();

button0.tabIndex = int.MAX_VALUE;

var button1:Sprite = drawSprite();

 

button0.addEventListener(FocusEvent.FOCUS_IN, lockTab);

 

function lockTab(event:FocusEvent):void { }

 

function drawSprite():Sprite

{

        var sprite:Sprite = new Sprite();

        with (sprite.graphics)

        {

                beginFill(Math.random() * 0xFFFFFF);

                drawRect(-50, -50, 100, 100);

                endFill();

        }

        sprite.x = stage.stageWidth * Math.random();

        sprite.y = stage.stageHeight * Math.random();

        sprite.buttonMode = true;

        return addChild(sprite) as Sprite;

}

private var roots:DisplayObject;

private var rootss:InteractiveObject;

...

rootss = roots as InteractiveObject;

...

rootss.tabEnabled = false;

rootss.tabChildren = false;

...

1119: Access of possibly undefined property tabChildren through a reference with static type flash.display:InteractiveObject.

(roots as MovieClip).tabEnabled = false;

(roots as MovieClip).tabChildren = false;

Error #1009: Cannot access a property or method of a null object reference.