[Dojo-interest] Extending dojo.dnd.Source, move not happening. Ideas?

[Soulhuntre]

Hey all!

I put a Dojo question up on Stack Overflow, but I figured this might also be
a good place for it. So here it goes...

Ok... I have a simple dojo page with the bare essentials. Three UL's with
some LI's in them. The idea si to allow drag-n-drop among them but if any UL
goes empty due to the last item being dragged out, I will put up a message
to the user to gie them some instructions.

In order to do that, I wanted to extend the dojo.dnd.Source dijit and add
some intelligence. It seemed easy enough. To keep things simple (I am
loading Dojo from a CDN) I am simply declating my extension as opposed to
doing full on module load. The declaration function is here...

====================================

function declare_mockupSmartDndUl(){
dojo.require("dojo.dnd.Source");
dojo.provide("mockup.SmartDndUl");
dojo.declare("mockup.SmartDndUl", dojo.dnd.Source, {
    markupFactory: function(params, node){
        //params._skipStartup = true;
        return new mockup.SmartDndUl(node, params);
    },
    onDndDrop: function(source, nodes, copy){
        console.debug('onDndDrop!');    
        if(this == source){
            // reordering items
            console.debug('moving items from us');
            // DO SOMETHING HERE
        }else{
            // moving items to us
            console.debug('moving items to us');
            // DO SOMETHING HERE
        }

        console.debug('this = ' + this );
        console.debug('source = ' + source );   
        console.debug('nodes = ' + nodes);
        console.debug('copy = ' + copy);
        return dojo.dnd.Source.prototype.onDndDrop.call(this, source, nodes,
copy);
    }   
});
}

====================================

I have a init function to use this to decorate the lists...

====================================

dojo.addOnLoad(function(){
declare_mockupSmartDndUl();
if(dojo.byId('list1')){
    //new mockup.SmartDndUl(dojo.byId('list1'));
    new dojo.dnd.Source(dojo.byId('list1'));
}

if(dojo.byId('list2')){
    new mockup.SmartDndUl(dojo.byId('list2'));
    //new dojo.dnd.Source(dojo.byId('list2'));
}

if(dojo.byId('list3')){
    new mockup.SmartDndUl(dojo.byId('list3'));
    //new dojo.dnd.Source(dojo.byId('list3'));
}
});

====================================

It is fine as far as it goes, you will notice I left "list1" as a standard
dojo dnd source for testing.

The problem is this - list1 will happily accept items from lists 2 & 3 who
will move or copy as apprriate. However lists 2 & 3 refuce to accept items
from list1. It is as if the DND operation is being cancelled, but the
debugger does show the dojo.dnd.Source.prototype.onDndDrop.call happening,
and the paramaters do look ok to me.

Now, the documentation here is really weak, so the example I took some of
this from may be way out of date (I am using 1.4).

Can anyone fill me in on what might be the issue with my extension dijit?

Thanks!
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