vertical align menu bar design for desktop application

programming lang :: C#

I am trying to design menu bar with show hide style in the vertical left side of application interface. But can not find any reference for this. Please can anyone guide me.

e.g.

main menu :: USER

   sub menu :: create user

   sub menu :: edit user

   sub menu :: delete user

main menu :: REPORT

   sub menu :: daily report

   sub menu :: monthly report

The main menu should display USER & REPORT. When clicked on of these menu should show the sub menu else hidden. How can I design such menu bar.