Switch Layers Script Question

Question

Hi I have a small script here which someone from these forums posted not too long ago... was it Noel? Either way, this script is fantastic and brings up a sub-menu to switch documents. When the menu pops up, it shows a list of all open documents in Photoshop. (I actually modified this script so all it does is switch documents instead of copying the active layer to another document.. somehow I managed it with the very basic knowledge I have )
The default document selection (the document name that is highlighted in the menu) when the list opens is "0"
I'm looking for a way to get the highlighted selection to reflect the active document instead of "0".
I think it's somewhere in this line of code:
win.NewList.selection = 0;
and I've tried changing the 0 to "actLay" and also "activeLayer" but it throws me an error message. Is there a way to get the active document as the highlighted selection? Here's the code...
var aDoc = app.activeDocument;
var AllDocs = app.documents;
var actLay = aDoc.activeLayer;
if (AllDocs.length > 1) {
var itemDoc = null;
var win = new Window("dialog","Switch Documents");
this.windowRef = win;
win.Txt1 = win.add ("statictext", undefined, "Switch to which document?");
win.NewList=win.add ("dropdownlist", undefined)
for (var m = 0; m < AllDocs.length; m++) {
win.NewList.add("item", AllDocs[m].name) 
win.NewList.selection = 0;
itemDoc = win.NewList.selection.actLay;
win.cancelBtn = win.add("button", undefined, "Switch");
win.cancelElement = win.cancelBtn;
win.NewList.onChange= function () {
    itemDoc = win.NewList.selection.index;
    return itemDoc;
win.show();
app.activeDocument = app.documents[itemDoc];
app.refresh();

Answer 1

Here's your original code with just minor changes:
Added a var to hold activeDocument index.
Added if statement to set the above variable.
Added a line to set the dropdownlist selection.
You should also start scripts with the target application. In this case: #target photoshop
#target photoshop  
    var aDoc = app.activeDocument; 
    var AllDocs = app.documents; 
    var actLay = aDoc.activeLayer;
    var activeIndex;//add var to hold activeDocument's index
    if (AllDocs.length > 1) { 
    var itemDoc = null; 
    var win = new Window("dialog","Switch Documents"); 
    this.windowRef = win; 
    win.Txt1 = win.add ("statictext", undefined, "Switch to which document?"); 
    win.NewList=win.add ("dropdownlist", undefined) 
    for (var m = 0; m < AllDocs.length; m++) { 
    win.NewList.add("item", AllDocs[m].name)  
    if(AllDocs[m].name == aDoc.name){activeIndex = m}//set activeIndex if activeDocument name matches current doc in list
var docR = activeDocument
    win.NewList.selection = activeIndex;   //Set selection for dropdownlist
    //itemDoc = win.NewList.selection.actLay;
    win.cancelBtn = win.add("button", undefined, "Switch"); 
    win.cancelElement = win.cancelBtn; 
    win.NewList.onChange= function () { 
        itemDoc = win.NewList.selection.index; 
        return itemDoc; 
    win.show(); 
    app.activeDocument = app.documents[itemDoc]; 
    app.refresh();