How to create a screen with checkboxes?

[euverve]

How could I create like these:

Screenshot A:
http://img200.imageshack.us/img200/7330/selectadditionaltasks.jpg

Screenshot B:
http://img40.imageshack.us/img40/5352/installp.jpg

Screenshot C:
http://img59.imageshack.us/img59/1184/finishinstall.jpg

I hope you got my point.

[pww]

add a new screen in the 'Before installing' section, it should be of type Check Boxes or Custom.
You may also replace the default After installing screen with a custom one to put a Launch checkbox.