How to set background image to my custom creative tab.

Here is my code:

 public static class bettermushroomstab extends ItemGroup {
        public bettermushroomstab(String label) {
            super("bettermushroomstab");
            this.setBackgroundImage("Bettermushroomstab.png");
        }
        
        private void setBackgroundImage(String string) {
            // TODO Auto-generated method stub
            
        }

        @Override
        public ItemStack makeIcon() {
            
            return ItemInit.COOKEDMUSHROOM.get().getDefaultInstance();
        }
        
    }

Edited June 11, 20214 yr by FLUFFLE PUFF