Thanks Roberts, that surely is a clue.
to find out for myself I tried a few experiments, it seems changing the names of four extensions, listing them as A, B, C, D, or aa, ab, ac, ad, made no difference to the order or grouping of the apps displayed on the wbar. modifying the onboot list had no effect as Roberts stated, is definitely not related to wbar listing. uninstalled all extension between renaming and rebooted also,
the order of the apps listed on the wbar are currently locked in order since I last changed their names within the desktop entry file, so either the actual *.desktop file name or an entry within it holds the key I think. will have to revisit the desktop entry file I think, am not giving up though.