dj control air browser buttons

how can i light up the browser buttons? when i plug in the controller, every led lights up (including the browser buttons) but while working / mixing, the light is off at the folder / file buttons.
the 2nd question is what function have the up- & down buttons at the pad mode-setting section (above & under the effects button)?
i already made an driver update to v21 and use the djuced software on a win7 64 bit.

thnx in advance for reply!
greets markus