XML Won't Transform in Batch [JS, CS3]

Question

When I use import xml manually into indesign, it works - but when I import it using the script below, it does not apply the transformation.
Any ideas?
with(app.activeDocument.xmlImportPreferences) {
        allowTransform = true;
        transformFilename = XMLTransformFile.STYLESHEET_IN_XML;
        createLinkToXML = false;
        ignoreWhitespace =true;
        ignoreUnmatchedIncoming = false;
        importCALSTables = true;
        importToSelected = false;
        allowTransform = false;
       importTextIntoTables = true;   
       repeatTextElements = false;
       removeUnmatchedExisting = false;
       importStyle = XMLImportStyles.MERGE_IMPORT;

Answer 1

arrgh, this was not was i wanted to test: it works with cs3 if you omit the with {} statement.
if you set the xmlImportPreferences direct it does work here.
app.activeDocument.xmlImportPreferences.allowTransform = true;
app.activeDocument.xmlImportPreferences.transformFilename = XMLTransformFile.STYLESHEET_IN_XML;
so this is not working:
var _file = File.openDialog ("Choose XML File");
with(app.activeDocument.xmlImportPreferences) {
        allowTransform = true;
        transformFilename = XMLTransformFile.STYLESHEET_IN_XML;
        //transformFilename = File.openDialog ("Choose XSL File");
app.activeDocument.importXML(_file);
but this works fine:
var _file = File.openDialog ("Choose XML File");
app.activeDocument.xmlImportPreferences.allowTransform = true;
app.activeDocument.xmlImportPreferences.transformFilename = XMLTransformFile.STYLESHEET_IN_XML;
//transformFilename = File.openDialog ("Choose XSL File");   
app.activeDocument.importXML(_file);