I've been searching the web to verify this after reading it on The Official Walter Simonson Page on FB & it appears to be true, (tho it may have happened last year). If a story like this doesn't bring a tear to your eye...
Fresh Life - Little boy lost at Comic Con.
Other sites seem to confirm the story:
And Finally Asking The Flash To Help Find Daddy Bleeding Cool Comic Book, Movies and TV News and Rumors
BCS: The Flash and Wonder Woman help Lost Child
Flash Saves Little Boy In Real Life - Comic Vine
Blasphemes: Super Awesome