Change Layout after set_table_for_first_display

Folks,

I have a requirement where I need to create new button in ALV toolbar and if user clicked on that button Layout2 is to be set and display in the ALV.

So I have created new Button in ALV toolbar,

Created new layout as well.

Please guide me how I can set this new layout on user action. i.e. after SET_TABLE_FOR_FIRST_DISPLAY.

Thanks,

Anmol.