Problem with NW_WIDGET_FACTORY_window and content loading

I've spun my tires on this and can't figure out what's going on.

I'm dynamically creating a new window widget at runtime given a user's 
onclick event.

The following works just as I'd expect (although I patched 
NW_WIDGET_window_create_load_append to not call __env__.addToPageQueue() 
if url was null or blank):

_nwSearchWindow = NW_WIDGET_window_create_load_append(500, 400, 100, 
100, "Customer Search", "", "");
__env__.addToPageQueue("Broker?env="+tscEnvironment+"&portal=none&template=glb/customer/customerSearch.xml",
                        _nwSearchWindow.contentObj.contentNode, false, 
_customerSearch = new CustomerSearch(), "constructor");

While the following doesn't work:

_nwSearchWindow = NW_WIDGET_FACTORY_window("Customer Search", 100, 100, 
500, 400);
__env__.addToPageQueue("Broker?env="+tscEnvironment+"&portal=none&template=glb/customer/customerSearch.xml",
                        _nwSearchWindow.contentObj.contentNode, false, 
_customerSearch = new CustomerSearch(), "constructor");

I can't for the life of me figure out why. All create_load_append does 
is call NW_WIDGET_FACTORY_window and return the window ref.

I then modified NW_WIDGET_window_create_load_append so that I could pass 
it two extra parameters (optionally) and have it set a callback method 
on the addToPageQueue() call. The calling code then looks like:

_nwSearchWindow = NW_WIDGET_window_create_load_append(400, 300, 100, 
100, "Customer Search", "",
                    
"Broker?env="+tscEnvironment+"&portal=none&template=glb/customer/customerSearch.xml",
                    _customerSearch = new CustomerSearch(), "constructor");

This works like a charm. I'm still miffed about my direct call to 
NW_WIDGET_FACTORY_window, but would like to know what people think about 
adding the two extra (optional) parameters to 
NW_WIDGET_window_create_load_append?

--Michael


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