gnome-panel from home:opensuse_zh:flashback project
Select Your Operating System
Add repository and install manually
For SLE 12 SP2 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:opensuse_zh:flashback/SLE_12_SP2/home:opensuse_zh:flashback.repo zypper refresh zypper install gnome-panel