wii balance board compatible with dolphin?

[dennisthemenace]

Okay, I managed to connect the balanceboard in dolphin. at least it says "1 connected".
the led of the BB is out the whole time, also when I press the power-button on the BB.
when I start Wiifitplus, it says ingame: "press the sync buttons on the wii balanceboard and the wii console" (see attachment)
so obviously, it doesnt recognize the BB as BB
if I press the sync-button on BB, led starts blinking, nut after that, it isnt connected any more in dolphin...