SetStyle not affecting components already formatted

Question

I have a form and everything is components:  labels, comboBox button.  I have applied a text format to all the elements.  I want the user to select a font from the combo box drop down and then all fonts change.  However, I can only get this to work when I don't apply any textFormats to my components initially.    I know in as2 you had to setNewTextFormat, is it somewhat similar with this setStyle?  Here is my code:
package
     import flash.display.*;
     import flash.events.*;
     import flash.text.*;
     import fl.controls.*;
     import fl.managers.StyleManager;
     import fl.motion.Color;
     import flash.geom.ColorTransform;
     public class CatProcess extends MovieClip
          //LABEL VARIABLES
          var headingTxt:Label;
          var userLabel:Label;
          var paletteLabel:Label;
          var ageLabel:Label;
          //TEXT INPUT VARIABLES
          var ageInputBox:TextInput;
          var nameInputBox:TextInput;
          //TEXT FORMAT VARIABLES
          var standardFormat:TextFormat;
          var headingFormat:TextFormat;
          var arialFormat:TextFormat
          var courierFormat:TextFormat;
          //MISC VARIABLES
          var userName:String;
          var fontCombo:ComboBox;
          var submit_btn:Button;
          public function CatProcess()
               //TEXT FORMATS
               headingFormat=new TextFormat();
               headingFormat.font = "Arial";
               headingFormat.size=16;
               standardFormat=new TextFormat()
               standardFormat.font="Arial"
               standardFormat.size=12;
               arialFormat=new TextFormat();
               arialFormat.font = "Arial";
               arialFormat.size=12;
               courierFormat=new TextFormat();
               courierFormat.font="courier"
               courierFormat.size=12;
               //FORM COMPONENT ELEMENTS
               //Heading
               headingTxt=new Label();
               headingTxt.text = "Olivers Cat Sanctuary";
               headingTxt.autoSize = TextFieldAutoSize.LEFT;
               headingTxt.setStyle("textFormat",headingFormat);
               headingTxt.move(183.2,22);
               addChild(headingTxt);
               //Name Label
               userLabel=new Label();
               userLabel.text = "Please Enter your name";
               userLabel.autoSize = TextFieldAutoSize.LEFT;
               userLabel.setStyle("textFormat",standardFormat);
               userLabel.move(50,106);
               addChild(userLabel);
               //Name inputBox
               nameInputBox=new TextInput ();
               nameInputBox.move(400,103);
               addChild(nameInputBox);
               //Palette Label
               paletteLabel=new Label();
               paletteLabel.text = "Please select a font";
               paletteLabel.autoSize = TextFieldAutoSize.LEFT;
               paletteLabel.setStyle("textFormat",standardFormat);
               paletteLabel.move(50,157);
               addChild(paletteLabel);
               //Palette ComboBox
               fontCombo=new ComboBox();
               fontCombo.addItem({label:"Arial"});
               fontCombo.addItem({label:"Courier"});
               fontCombo.move(400,157);
               addChild(fontCombo);
               fontCombo.addEventListener(Event.CHANGE, comboHandler);
               ageLabel=new Label();
               ageLabel.text = "Please enter your age";
               ageLabel.autoSize = TextFieldAutoSize.LEFT;
               ageLabel.setStyle("textFormat",standardFormat);
               ageLabel.move(50,209);
               addChild(ageLabel);
               ageInputBox = new TextInput();
               ageInputBox.move(400,211);
               addChild(ageInputBox);
               submit_btn=new Button();
               submit_btn.move(255,258);
               submit_btn.label = "submit";
               submit_btn.setStyle("textFormat",standardFormat);
               addChild(submit_btn);
          }//end constructor function
          private function comboHandler(event:Event):void
               var fontType:String = event.currentTarget.selectedItem.label;
               if (fontType== "Arial") {
                    StyleManager.setStyle("textFormat", arialFormat);
               if (fontType=="Courier") {
                    StyleManager.setStyle("textFormat", courierFormat);

Answer 1

package
     import flash.display.*;
     import flash.events.*;
     import flash.text.*;
     import fl.controls.*;
     import fl.managers.StyleManager;
     import fl.motion.Color;
     import flash.geom.ColorTransform;
public class CatProcess extends MovieClip
//LABEL VARIABLES
public var headingTxt:Label;
public var userLabel:Label;
public var paletteLabel:Label;
public var ageLabel:Label;
//TEXT INPUT VARIABLES
public var ageInputBox:TextInput;
public var nameInputBox:TextInput;
//TEXT FORMAT VARIABLES
public var standardFormat:TextFormat;
public var headingFormat:TextFormat;
public var arialFormat:TextFormat
public var courierFormat:TextFormat;
//MISC VARIABLES
public var userName:String;
public var fontCombo:ComboBox;
public var submit_btn:Button;
public function Main()
              //TEXT FORMATS
              arialFormat=new TextFormat();
              arialFormat.font = "Arial";
              arialFormat.size=12;
              courierFormat=new TextFormat();
              courierFormat.font="courier"
              courierFormat.size=12;
              //FORM COMPONENT ELEMENTS
              //Heading
              headingTxt=new Label();
              headingTxt.text = "Olivers Cat Sanctuary";
              headingTxt.autoSize = TextFieldAutoSize.LEFT;
              headingTxt.setStyle("textFormat",headingFormat);
              headingTxt.move(183.2,22);
              addChild(headingTxt);
              //Name Label
              userLabel=new Label();
              userLabel.text = "Please Enter your name";
              userLabel.autoSize = TextFieldAutoSize.LEFT;
              userLabel.setStyle("textFormat",standardFormat);
              userLabel.move(50,106);
              addChild(userLabel);
              //Name inputBox
              nameInputBox=new TextInput ();
              nameInputBox.move(400,103);
              addChild(nameInputBox);
              //Palette Label
              paletteLabel=new Label();
              paletteLabel.text = "Please select a font";
              paletteLabel.autoSize = TextFieldAutoSize.LEFT;
              paletteLabel.setStyle("textFormat",standardFormat);
              paletteLabel.move(50,157);
              addChild(paletteLabel);
              //Palette ComboBox
              fontCombo=new ComboBox();
              fontCombo.addItem({label:"Arial"});
              fontCombo.addItem({label:"Courier"});
              fontCombo.move(400,157);
              addChild(fontCombo);
              fontCombo.addEventListener(Event.CHANGE, comboHandler);
              ageLabel=new Label();
              ageLabel.text = "Please enter your age";
              ageLabel.autoSize = TextFieldAutoSize.LEFT;
              ageLabel.setStyle("textFormat",standardFormat);
              ageLabel.move(50,209);
              addChild(ageLabel);
              ageInputBox = new TextInput();
              ageInputBox.move(400,211);
              addChild(ageInputBox);
              submit_btn=new Button();
              submit_btn.move(255,258);
              submit_btn.label = "submit";
              submit_btn.setStyle("textFormat",standardFormat);
              addChild(submit_btn);
          }//end constructor function
private function comboHandler(event:Event):void
var fontType:String = event.currentTarget.selectedItem.label;
if (fontType== "Arial") {
StyleManager.setStyle("textFormat", arialFormat);
if (fontType=="Courier") {
StyleManager.setStyle("textFormat", courierFormat);