Input textfield focus problem

Question

Hello
I'm developing a series of learning aids and the final screen requires the user to input some text.
I have it working correctly but now need to make it a little more user friendly.
At the moment the only way for the user to input the text is to click in each box. There are a total of 6 input text boxes.
I would like to direct the user to a particular input text and then have them be able to use the tab key or the enter key or mouse clicks to proceed.
As the first step I added the stage.focus = inputStarName1. See code below. As soon as I added the stage.focus = inputStarName1 line I get the dredded error 1009 when the code invokes TypeNames.
What do I need to do to get rid of this error?
Any help will be greatly appreciated.
package
    import flash.display.*;
    import flash.text.*;
    import flash.events.*;
    public class TypeNames extends MovieClip
        public function TypeNames()
            addEventListener(Event.ADDED_TO_STAGE, addedHandler);
            addEventListener(Event.REMOVED_FROM_STAGE, removedHandler);
            backBtn.buttonMode = true;
            resetBtn.buttonMode = true;
            scoreBtn.buttonMode = true;
            backBtn.addEventListener(MouseEvent.CLICK, back);
            resetBtn.addEventListener(MouseEvent.CLICK, reset);
            scoreBtn.addEventListener(MouseEvent.CLICK, mark);
            scoreBtn.alpha = 1;
            feedback.alpha = 0;
            correct1.alpha = 0;
            correct2.alpha = 0;
            correct3.alpha = 0;
            correct4.alpha = 0;
            correct5.alpha = 0;
            correct6.alpha = 0;
            var score:uint = 0;// sets score variable to zero
            // Defines Input text format
            var inputFormat:TextFormat = new TextFormat();
            inputFormat.font = "Arial Bold";
            inputFormat.size = 14;
            inputFormat.align = "center";
            inputFormat.color = 0xffff00;
            //Defines and adds text input boxes for star names
            var inputStarName1:TextField = new TextField();
            inputStarName1.type = "input";
            inputStarName1.defaultTextFormat = inputFormat;
            inputStarName1.x = 12;
            inputStarName1.y = -38;
            inputStarName1.height = 18;
            inputStarName1.width = 70;
            inputStarName1.background = true;
            inputStarName1.border = true;
            inputStarName1.backgroundColor = 0x555555;
            inputStarName1.borderColor = 0xffff00;
            addChild(inputStarName1);
            stage.focus = inputStarName1;

Answer 1

Hi Kglad
Thanks for the prompt response. I tried your suggestion but got error 1120.
The addedHandler function is presently only used to center the screens created by the class packages.
I tried moving the addedHandler function before the constructor but it made no difference.
Just in case there is something else in my code that's messing things up I have copied it in its entirety below.
As you will see I still need to learn how to use arrays and for loops to shorten up my code but I needed to get this operational in a hurry hence the brute force approach.
Thanks again for your help
package
    import flash.display.*;
    import flash.text.*;
    import flash.events.*;
    public class TypeNames extends MovieClip
        public function TypeNames()
            addEventListener(Event.ADDED_TO_STAGE, addedHandler);
            addEventListener(Event.REMOVED_FROM_STAGE, removedHandler);
            backBtn.buttonMode = true;
            resetBtn.buttonMode = true;
            scoreBtn.buttonMode = true;
            backBtn.addEventListener(MouseEvent.CLICK, back);
            resetBtn.addEventListener(MouseEvent.CLICK, reset);
            scoreBtn.addEventListener(MouseEvent.CLICK, mark);
            scoreBtn.alpha = 1;
            feedback.alpha = 0;
            correct1.alpha = 0;
            correct2.alpha = 0;
            correct3.alpha = 0;
            correct4.alpha = 0;
            correct5.alpha = 0;
            correct6.alpha = 0;
            var score:uint = 0;// sets score variable to zero
            // Defines Input text format
            var inputFormat:TextFormat = new TextFormat();
            inputFormat.font = "Arial Bold";
            inputFormat.size = 14;
            inputFormat.align = "center";
            inputFormat.color = 0xffff00;
            //Defines and adds text input boxes for star names
            var inputStarName1:TextField = new TextField();
            inputStarName1.type = "input";
            inputStarName1.defaultTextFormat = inputFormat;
            inputStarName1.x = 12;
            inputStarName1.y = -38;
            inputStarName1.height = 18;
            inputStarName1.width = 70;
            inputStarName1.background = true;
            inputStarName1.border = true;
            inputStarName1.backgroundColor = 0x555555;
            inputStarName1.borderColor = 0xffff00;
            addChild(inputStarName1);
            var inputStarName2:TextField = new TextField();
            inputStarName2.type = "input";
            inputStarName2.defaultTextFormat = inputFormat;
            inputStarName2.x = -270;
            inputStarName2.y = -98;
            inputStarName2.height = 18;
            inputStarName2.width = 80;
            inputStarName2.background = true;
            inputStarName2.border = true;
            inputStarName2.backgroundColor = 0x555555;
            inputStarName2.borderColor = 0xffff00;
            addChild(inputStarName2);
            var inputStarName3:TextField = new TextField();
            inputStarName3.type = "input";
            inputStarName3.defaultTextFormat = inputFormat;
            inputStarName3.x = 75.3;
            inputStarName3.y = 38.3;
            inputStarName3.height = 18;
            inputStarName3.width = 70;
            inputStarName3.background = true;
            inputStarName3.border = true;
            inputStarName3.backgroundColor = 0x555555;
            inputStarName3.borderColor = 0xffff00;
            addChild(inputStarName3);
            var inputStarName4:TextField = new TextField();
            inputStarName4.type = "input";
            inputStarName4.defaultTextFormat = inputFormat;
            inputStarName4.x = 227.45;
            inputStarName4.y = 99.26;
            inputStarName4.height = 18;
            inputStarName4.width = 70;
            inputStarName4.background = true;
            inputStarName4.border = true;
            inputStarName4.backgroundColor = 0x555555;
            inputStarName4.borderColor = 0xffff00;
            addChild(inputStarName4);
            var inputStarName5:TextField = new TextField();
            inputStarName5.type = "input";
            inputStarName5.defaultTextFormat = inputFormat;
            inputStarName5.x = 94.45;
            inputStarName5.y = -72;
            inputStarName5.height = 18;
            inputStarName5.width = 70;
            inputStarName5.background = true;
            inputStarName5.border = true;
            inputStarName5.backgroundColor = 0x555555;
            inputStarName5.borderColor = 0xffff00;
            addChild(inputStarName5);
            var inputStarName6:TextField = new TextField();
            inputStarName6.type = "input";
            inputStarName6.defaultTextFormat = inputFormat;
            inputStarName6.x = 211;
            inputStarName6.y = 29.5;
            inputStarName6.height = 18;
            inputStarName6.width = 70;
            inputStarName6.background = true;
            inputStarName6.border = true;
            inputStarName6.backgroundColor = 0x555555;
            inputStarName6.borderColor = 0xffff00;
            addChild(inputStarName6);
            function mark(event:MouseEvent):void
                if (inputStarName1.text.toUpperCase() == "POLARIS"
                    && inputStarName2.text.toUpperCase() == "SCHEDAR"
                    && inputStarName3.text.toUpperCase() == "KOCHAB"
                    && inputStarName4.text.toUpperCase() == "ALKAID"
                    && inputStarName5.text.toUpperCase() == "DUBHE"
                    && inputStarName6.text.toUpperCase() == "ALIOTH")
                    MovieClip(parent).gotoReward();
                else
                    feedback.alpha = 1;
                if (inputStarName1.text.toUpperCase() !== "POLARIS")
                    correct1.alpha = 1;
                    correct1.text = "Polaris";
                if (inputStarName2.text.toUpperCase() !== "SCHEDAR")
                    correct2.alpha = 1;
                    correct2.text = "Schedar";
                if (inputStarName3.text.toUpperCase() !== "KOCHAB")
                    correct3.alpha = 1;
                    correct3.text = "Kochab";
                if (inputStarName4.text.toUpperCase() !== "ALKAID" )
                    correct4.alpha = 1;
                    correct4.text = "Alkaid";
                if (inputStarName5.text.toUpperCase() !== "DUBHE" )
                    correct5.alpha = 1;
                    correct5.text = "Dubhe";
                if (inputStarName6.text.toUpperCase() !== "ALIOTH")
                    correct6.alpha = 1;
                    correct6.text = "Alioth";
        private function reset(event:MouseEvent):void
            MovieClip(parent).gotoType();
        private function addedHandler(event:Event):void
            this.x = stage.stageWidth / 2;
            this.y = stage.stageHeight / 2;
        private function removedHandler(event:Event):void
        private function back(event:MouseEvent):void
            MovieClip(parent).gotoLearn();