From your top-level VI select File/Print. Explore all the options. You can print just your top-level VI or the whole heirarchy. Under block diagram options you can select hidden frames. That will create an image for code in all of your case structures, event structures, stacked sequence structures, etc.
When you get to the end of the wizzard you will have some choices for how to save. Select rtf. I prefer html but if you choose that make sure that when you get to "save" you select a new empty directory. If you select your desktop you might end up with a few hundred png files on it.
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LabVIEW 2012
