When I make my movieclip selectable I lose the ability to scroll the textarea in the movie clip

// Tooltip.as
 
package {
 
    import flash.display.Sprite;
	import fl.controls.TextArea;
    import flash.text.TextField;
    import flash.text.TextFormat;
    import flash.text.TextFieldAutoSize;
    import flash.text.TextLineMetrics;
    import flash.display.BlendMode;
    import flash.utils.Timer;
    import flash.events.MouseEvent;
    
    public class ToolTip extends Sprite {
 
        private var _tip:String;
 
        // You'll need this for proper text formatting
        //private var _tf:TextField = new TextField();
        private var _tf:TextArea = new TextArea();
        private var _format:TextFormat = new TextFormat();
 
        private static const ROUND:Number = 2;
        //private static const HEIGHT:Number = 25;
		private static const HEIGHT:Number = 400;
		private static const WIDTH:Number = 400;
        private static const FONT_SIZE:uint = 14;
        private static const FONT:String = 'Arial';
		private static const FONTCOLOR:String = "#ffffff";
        private static const PADDING:Number = 5;
        private static const MIN_ALPHA:Number = .00;
        private static const ALPHA_INC:Number = .05;
        //private static const MAX_ALPHA:Number = .75;
        private static const MAX_ALPHA:Number = 1.0;
        private static const REFRESH:Number = MAX_ALPHA / ALPHA_INC;
 
        // For fading in and out
        private var _timer:Timer;
        
        public function ToolTip( tip:String ) {
 
            // Hold onto the tip for posterity
            _tip = tip;
            
            // This ensures the textfield inherits this class's
            // alpha property.  Very important because otherwise tf
            // would always have an alpha of 1 meaning it will always be visible
            this.blendMode = BlendMode.LAYER;
            
            _format.size = FONT_SIZE;
            _format.font = FONT;
			_format.color = FONTCOLOR;
            _tf.setStyle("size", FONT_SIZE);
			_tf.setStyle("font", FONT);
			_tf.setStyle("color", FONTCOLOR);
			
            // Make sure the text behaves and looks
            // the way text on a button should
            //_tf.defaultTextFormat = _format;    // Always call defaultTextFormat before setting text otherwise
                                           // the text doesn't use the formatting defined in tf
			
            //_tf.autoSize = TextFieldAutoSize.LEFT;  // You have to set autoSize to TextFieldAutoSize.LEFT
                                                    // for box.textWidth to be accurate
            //_tf.multiline = true;
			_tf.width = WIDTH;
			_tf.height = HEIGHT;
            _tf.text = tip;
            //_tf.selectable = false;
            _tf.x += PADDING;
            _tf.y += PADDING;
            addChild( _tf );
 
            // Draw the background
            graphics.beginFill( 0x666666, 1 );
            //graphics.drawRoundRect( 0, 0, _tf.textWidth+PADDING*4, HEIGHT, ROUND );
            graphics.drawRoundRect( 0, 0, WIDTH+PADDING*4, HEIGHT, ROUND );
            graphics.endFill();
            this.alpha = MIN_ALPHA;
        }
 
        // You have to call this after
        // the tooltip has been added to the
        // display list
        public function start():void {
            this.parent.addEventListener( MouseEvent.MOUSE_OVER, mouse_over );
        }
 
        public function mouse_over( e:MouseEvent ):void {
            this.parent.setChildIndex( this, this.parent.numChildren-1 ) // Move the tool tip to the top!
            var fadeSpeed:Number = 500 / REFRESH;
            _timer = new Timer( fadeSpeed, REFRESH );
            _timer.addEventListener( "timer", fadeIn )
            _timer.start();
            this.parent.addEventListener( MouseEvent.MOUSE_OUT, mouse_out );
        }
        
        public function mouse_out( e:MouseEvent ):void {
            var fadeSpeed:Number = 500 / REFRESH;
            _timer = new Timer( fadeSpeed, REFRESH );
            _timer.addEventListener( "timer", fadeOut )
            _timer.start();
        }
 
        private function fadeIn( i:uint ):void {
            this.alpha += ALPHA_INC;
        }
        
        private function fadeOut( i:uint ):void {
            this.alpha -= ALPHA_INC;
        }
    }                                      
}

                                              

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function selectedAbstract(e:Event):void {
	var abstractName:String;// Abstract name with index (i.e., a0, a1, a2, etc.)
	var abstractIndex:Number;// Abstract number
	var strLen:Number;// Length of abstract name
 
	strLen=e.currentTarget.name.length;
	abstractName=e.currentTarget.name.substring(1);
	abstractIndex=Number(abstractName);
 
	AAPglobal.whichAbstract=abstractIndex;
	gotoAndPlay("abstractPlayer");
}

                                              

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function selectedAbstract(e:Event):void {
        var abstract:AbstractDisplay = e.currentTarget as AbstractDisplay;
        var abstractName:String;// Abstract name with index (i.e., a0, a1, a2, etc.)
        var abstractIndex:Number;// Abstract number
        var strLen:Number;// Length of abstract name
 
        strLen= abstract.name.length;
        abstractName=abstract.name.substring(1);
        abstractIndex=Number(abstractName);
 
        AAPglobal.whichAbstract=abstractIndex;
        gotoAndPlay("abstractPlayer");
                                              

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