Checkbox Guide - Add example for "Check All"

Hi, please consider adding an example for checkboxes that require an “All” option.

I followed the answer provided here:

But my superior came down on me like a ton of bricks for using the “change.delegate” event… I don’t understand why because it seems to be the only option.

If there was an example of the correct methd on your website then perhaps I could be enlightened.

Edit: Ah nevermind it seems it was avknee-jerk reaction. It really is the only way to do it in my context.