the zones are contentclass defined : see the zone.ini configration file
you should had your template write in it :
i mean if i want to had a lyout to the article contentclass , i add it bby administration AND i add it in this config file like that :
[GlobalZoneLayout]
ZoneTypeName=Global zone layout
Zones[]=main
ZoneName[main]=Global zone
ZoneThumbnail=globalzone_layout.gif
Template=globalzonelayout.tpl AvailableForClasses[]=global_layout
AvailableForClasses[]=article <- add this line for your content class on all zoning you want.