I just discovered this by sheer accident – the best discoveries are like that. I am using R8.5.3 if it matters…
CTRL-SHIFT-PageDown (or PageUp) will move you from Design Tab
To Source Tab
AWESOME !!!
Productive!
XPage keyboard shortcut between design and source tab
Xomino 
…whoa.
Thanks for finding this!
… now if we can only figure out how to have DDE auto-launch *into* the Source pane. Great find!!
Great find!
(and +1 for Chris)
Great find!
Made another acidental discovery…
Try “Page Down + Ctrl + Shift” (in the same order with Ctrl & Shift from right side of keyboard) to change your reading order of XPage source to right-to-left.
To restore press “Page Up + Ctrl + Shift” (in the same order with Ctrl & Shift from left side of keyboard)
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