This is how I load those groups from maps_layout

    layout0 = require('layout_maps')
    group = self.view
    maps_sf = require('loq_sprite').newFactory( 'sheet_gameUI', 'sheet_mapTiles', 'sheet_mapsbackgound' )
    group.maps = layout0.createLayout(maps_sf)

    group:insert(group.maps.groups.layout0)