SNMP template creation for Draytek routers

I want to add SNMP graphs like dsl bandwidth in OpenNMS.
I already imported the SNMP mibs for that (VDSL-LINE-MIB) and comiled it succesfully.
I also created an SNMP Collection and called it Draytek-test. It includes Datacollectiongroup VDSL-LINE-MIB. In the system definitions I added the OID for a particulair Draytek ( But no graphs are showing up.
Where can I start debugging?