Under the Format menu:
Edit Source/View Page
it would be nice to have a built-in keyboard shortcut assigned to those two menu commands.
I have assigned Cmd-opt-R to both of them to toggle back and forth in System Prefs, but as a suggestion, Cmd-R is the keystroke for Refresh in web browsers (and my web software, RapidWeaver). Maybe re-assign Reveal (currently Cmd-R) to Cmd-opt-R?
Short history. I do webdesign and have about 400 code snippets in my web program’s proprietary format but it’s very basic (no preview, color code). I used another code collection program, CodeCollector (color coded syntax) and it was so buggy that I dumped it quickly. I then found Yojimbo and it was OK, but it didn’t color code syntax. Then when I evaluated my digital lifestyle needs, I discovered DT Pro was just the program for my needs.
I love the ability for DT Pro to be able store and render HTML files (and color code the syntax). It makes simple tweaks very easy to do, rather than publish to a .html file and check in a browser.