Virtual Layer Order

In our older IMF applications, all of the layers were described in draw order in a single AXL file but inside the application, they appeared to be sorted into various folders. Is this something we can emulate with the REST Manager or are we going to need to write an interface for layer management inside our Flex viewer? We have a lot of layers, which we are thinking of sorting by point, line, polygon and raster so they draw properly but we need to organize them inside the viewer for easy access.

Please point me to the appropriate documentation and we'll take it from there. Thanks.