My question is essentially the same as this one:
Add a date picker to system.xml on custom module
I’d like to add a customer frontend_model to support a date picker in Magento’s admin configuration.
When I try to follow the steps in the linked post, I get an empty screen. I can see in my system.log that “Mage/” is included at the front of the file-path. Normally this would imply an improper config.xml for the relevant module, but everything I’ve read on frontend_model doesn’t have it registered in the config.
When adding a custom frontend_model, is it necessary to register the block in config.xml?
It is not necessary to register a custom front_end model. It is necessary to reference the model by the name provided for the module.