I am looking to upgrade my flex viewer to 3.6 but it seems like I'm going to lose a critical widget my users have become familiar with and really like; the tocgroupwidget. (https://github.com/WestonSF/ArcGISFlexViewerTOCGroupWidget) This is a great widget that adds a layer list to your viewer that can be customized to allow for the "grouping" of layers within tabs. this is how i get around flex's inability to pull sublayers from various external webservices into one operation layer. while you still can't do that with or without this widget, putting these numerous layers into defined tabs is the next best thing.
i cant seem to find a newer version of this widget and would really like to know if it has been recompiled for 3.6. if not, it would be just as nice to know what the newest version of flex that supports it as i wont go any higher than the version that supports this widget.