Stolen base or passed ball?

[jroller]

Runner on first runs on the pitcher's throw home. Is well on way to 2nd when ball hits catcher's mitt and pops out on ground. Runner safely reaches second. Stolen base or passed ball?

Bottom line question: if the runner's action comes before a passed ball or wild pitch, it should be ruled a stolen base, and if he decides to move because of the wild pitch or passed ball it is ruled as such?

[Gfoley4]

Stolen base if the runner is already running before the wild pitch/passed ball

[jroller]

Thought as much. Thanks!