[Plugin: ZigWidgetClass] How do I make it work?

So a bit of a newb question here, but what do you mean when you say “It only works with widgets created by extending the built-in multi widget class.” and how do I get that working with my widgets.

tried it but it doesn’t work. I’m guessing it is because I havent done the above.

Cheers
Tyrhone

http://wordpress.org/extend/plugins/zigwidgetclass/