ALV Grid with ALV Tree

Hi Experts,

I have developed one ALV report by using cl_gui_alv_grid class. I need to provide expand all & unexpand like a hierarchely node for some rows.

For example i have 10 rows in alv output and out of 10 rows i need to provide + button from 5th row. When user click on + button it should show remaing 5 records. If they click again it should hide 5 rows.

Can any one suggest how to acheive this.

Thanks

Cris