Automatically refresh openhab 2 runtime

I use the openhab 2 version on Raspberry and try to configure, as an example, the items manually over Eclipse Smarthome Designer on a Mac (connected via Samba/SMB)
I create a .items file in the /conf folder on my Raspberry and hope to see the new items under the paper UI, but nothing happened. The same, if I try to link items to a existing Thing.

The openhab 2 documentation say:
“Changes are automatically loaded by the openHAB runtime.”

Whats wrong?