maybe you digitized them before geocoding?
You can try different things:
- make a new training vector, now that your data is geocoded and see if it now contains lat/lon coordinates.
- save your data as a new BEAM DIMAP file. For me, the vectors were then converted to the geographic coordinates.
- Digitize your training samples in a GIS (as WGS84) and import them as polygons as described here: Can't import vector data