All skins have a list of mandatory sections like 'EDIT', 'BUTTON', etc (main sections) and list of sections which may not exist in a skin.
If auxiliary section doesn't exists, then main section used instead.
I know a common solution for your issue, I will add a checking for unexisting sections at the skin loading and such sections will be added in run-time automatically, but time is required for that.
This issue will be solved in the nearest release.