if by the panel for users you mean the ability to reboot a VPS or reinstall it -- this is the primary role of VDSmanager (to get the detailed list of users' features, click here
http://ispsystem.com/en/features/vds/vdsadmin.html).
If you meant your server contol panel, you can install the one you like --
cpanel, directadmin, plesk. our control panel is ISPmanager (special offer - 3 EUR only. we drop the price of ISPmanager for the customers purchasing VDSmanager)