AAAARGH! Flash panel to Fireworks communication

This is making me CRAZY.

I wrote a .jsf file to export pages to PSDs and it works fine.

I then created a simple, custom Flash panel to allow for multiple export options.

Now, when I try to execute the same function via MMExecute(), nothing happens.

Is there something I'm missing about how Flash panels communicate with FW?

Here is the actionscript if anyone cares to investigate...

import mx.controls.ComboBox
import mx.controls.Button

Stage.scaleMode = "noScale";
Stage.align = "TL";

// Style the combo boxes
set_objects.setStyle("color", "0x060606");
set_effects.setStyle("color", "0x060606");
set_vectors.setStyle("color", "0x060606");
set_text.setStyle("color", "0x060606");

set_objects.setStyle("fontFamily", "Lucida Grande");
set_effects.setStyle("fontFamily", "Lucida Grande");
set_vectors.setStyle("fontFamily", "Lucida Grande");
set_text.setStyle("fontFamily", "Lucida Grande");

set_objects.setStyle("fontSize", "11");
set_effects.setStyle("fontSize", "11");
set_vectors.setStyle("fontSize", "11");
set_text.setStyle("fontSize", "11");

set_objects.setStyle("textSelectedColor", "0x336699");
set_effects.setStyle("textSelectedColor", "0x336699");
set_vectors.setStyle("textSelectedColor", "0x336699");
set_text.setStyle("textSelectedColor", "0x336699");

set_objects.setStyle("themeColor", "0xC5D0DA");
set_effects.setStyle("themeColor", "0xC5D0DA");
set_vectors.setStyle("themeColor", "0xC5D0DA");
set_text.setStyle("themeColor", "0xC5D0DA");

// Get initial selection values to pass as defaults
var set_objects_value:Number = 1;
var set_effects_value:Number = 1;
var set_vectors_value:Number = 1;
var set_text_value:Number = 1;

// Set up event listeners to handle changes in dropdown selections
var objListener:Object = new Object();
objListener.change = function() {
    set_objects_value = set_objects.selectedItem.data;
}
set_objects.addEventListener("change", objListener);

var effListener:Object = new Object();
effListener.change = function() {
    set_effects_value = set_effects.selectedItem.data;
}
set_effects.addEventListener("change", effListener);

var vecListener:Object = new Object();
vecListener.change = function() {
    set_vectors_value = set_vectors.selectedItem.data;
}
set_vectors.addEventListener("change", vecListener);

var txtListener:Object = new Object();
txtListener.change = function() {
    set_text_value = set_text.selectedItem.data;
}
set_text.addEventListener("change", txtListener);

// Set up the button event listener's function
function convertToPSD() {
    // Piece together the Fireworks javascript command
    var cmd:String      = 'function convertToPSD() {'
                    + '        if (fw.documents.length == 0) { return; };'
                   
                    + '        fw.setPref("PsdExport_Warn100", false);'
                    + '        fw.setPref("PsdExport_Layers", ' + set_objects_value + ');'
                    + '        fw.setPref("PsdExport_Effects", ' + set_effects_value + ');'
                    + '        fw.setPref("PsdExport_Vectors", ' + set_vectors_value + ');'
                    + '        fw.setPref("PsdExport_Text", ' + set_text_value + ');'
               
                    + '        var dom    = fw.getDocumentDOM();'
                   
                    + '        var currentPage = dom.currentPageNum;'
                   
                    + '        for (var i = 0, len = dom.pagesCount; i < len; i++) {'
               
                    + '            alert("Exporting page " + (i + 1) + " to PSD...");'
               
                    + '            dom.changeCurrentPage(i);'
                    + '            dom    = fw.getDocumentDOM();'
               
                    + '            var pathname = dom.filePathForSave;'
                    + '            pathname = pathname.slice(0, pathname.length - 4 - dom.docTitleWithoutExtension.length);'
                    + '            Files.createDirectory(pathname + "PagesToPSD_output");'
                    + '            var filename = pathname + "PagesToPSD_output" + "/" + dom.pageName + ".psd";'
                    + '            fw.exportPSD(null, filename);'
   
                    + '        }'
           
                    + '        dom.changeCurrentPage(currentPage);'
                   
                    + '}';
           
    // trace(cmd);
    MMExecute(cmd);
}

// When the "Export" button is pressed, call the "cmd" command and watch the magic happen (well, not yet...)
export_btn.addEventListener("click", convertToPSD);