Sweet Button - Launching a Lightbox stack.
Here is a short tutorial on how to launch an Lightbox Stack from a Sweet Button stack.
Take note of the Lightbox class & href in Edit Mode.
You can hide the Lightbox Launcher (via the settings) if you only want to launch the lightbox only via the sweet button. You probably want to add some content to the Lightbox though.
Add a class & href attributes into Sweet Button
When you click on the link button in Sweet Button, you will need to create a new attribute for class. Set the value to the class that is defined in the Lightbox stack in bold. You will also set the link to the href defined in the Lightbox stack highlighed above.