Multi-level Hierarchy In alv List using OO Programming

Hi all,

I want to display data in <b>ALV format</b> Which has <b>4</b> levels of hierarchy. Could any one help me out to achieve this using <b>OO programming</b>. if any one can send me a peace of code that will be very helpful to me.

Thanks & Regards,

<b>Swamy Mantha.</b>