[flexcoders] Module Error when re-loading a module

[boy_trike]

I have a main application that loads a module.  Everything works fine until I 
RE-LOAD the 
module (via a popup-menu button).  After that, when I dbl-click on a grid 
(which worked fine 
before.) I get the following error:

TypeError: Error #1007: Instantiation attempted on a non-constructor.
        at mx.controls::DataGrid/mx.controls:DataGrid::drawSeparators()
        at mx.controls::DataGrid/mx.controls:DataGrid::updateDisplayList()
        at mx.core::UIComponent/validateDisplayList()
        at mx.managers::LayoutManager/private::validateDisplayList()
        at mx.managers::LayoutManager/private::doPhasedInstantiation()
        at Function/http://adobe.com/AS3/2006/builtin::apply()
        at mx.core::UIComponent/private::callLaterDispatcher2()
        at mx.core::UIComponent/private::callLaterDispatcher()
        at [enterFrameEvent]

Any suggestions?

Thanks
Bruce