Why can't I get the value of "checkedState" in ScriptUI?

Question

I found I can't get checkedState's value recently, and anybody can help me?
The snippet script is following:
#target "InDesign-8.0"
main();
function main(){
    myInterFace();
    myTeardown();
function myInterFace(){
    //<fragment>
    var myDialog = app.dialogs.add({name:"Testing", canCancel:true});
    with(myDialog){
        //Add a dialog column.
        with(dialogColumns.add()){
            with(checkboxControls.add()){
                staticLabel = "Facing Pages";
                checkedState = true;
                minWidth = 140;
  if(myDialog.show() == true){
        var mycheckboxControl = app.dialogs.item(0).dialogColumns.item(0).checkboxControls.item(0);
        var pageMarginSetting = new Array;
        pageMarginSetting.push(mycheckboxControl.checkedState);
        alert("testing");
        formattingTemplate(pageMarginSetting);
        myDialog.destroy();
  else{
  myDialog.destroy()
function formattingTemplate(pageMarginSetting){
    var myFileNameString = "/C_Test_Template.indd"
    var myDoc = app.documents.add({name:myFileNameString});
    with(myDoc.documentPreferences){
        pageHeight = 280;
        pageWidth = 210;
        pageOrientation = PageOrientation.portrait;
        facingPages = pageMarginSetting[0];
        startPageNumber = 1;
    myDoc.save(File(Folder.desktop + myFileNameString));
function myTeardown(){

Answer 1

Try declaring the checkbox as a variable up in the dialog construction something like this:
//====================//
#target "InDesign-8.0"
main();
function main(){
    myInterFace();
function myInterFace(){
    var myDialog = app.dialogs.add({name:"Testing", canCancel:true});
    with(myDialog){
        //Add a dialog column.
        with(dialogColumns.add()){
            //checkbox as variable
            var myFPCheckbox =checkboxControls.add({staticLabel:"Facing Pages", checkedState:true, minWidth: 140})
            with(myFPCheckbox){
       if(myDialog.show() == true){
            var pageMarginSetting = new Array;
            pageMarginSetting.push(myFPCheckbox.checkedState);
            alert("testing checkbox result=  "+myFPCheckbox.checkedState);
            myDialog.destroy();
  else{
            myDialog.destroy()