Sybase - How to enable Automatic DB Expansion

HI Friends,

I am new to ASE.. have mostly worked on Oracle.

I have installed a sap system on Sybase. I need to know how can i enable Automatic DB Expansion feature which i think i didnt selected during installation.

I dont want to do this from DBACOCKPIT as this is not working properly and I need to run SGEN.

please help.