Hide Lenovo Yoga 10 Tablet (Android) system bar

I purchased yoga 10 tablet few days ago for a special purpose/apps. For that apps i need to run that in full screen. But i can't hide the system bar. By system bar i means bottom bar on the screen where it shows back/menu etc button. On my other tabs (not lenovo) it works fine. steps: 1. i root the device/tablets 2. then install and use below apps. FullScreen! Android Apps but on my lenovo after i root when i try that apps it crash/hung the tablet. Only a restart can again run the tablets On lenovo i use farma root app to root the device.... so, can any one help me to solve my issue. ? i really need to hide that system bar