Call afunction on attached movie

Hello,

i attach a movie to an other with this code
currentMc = clips[0].cont.attachMovie(“about”, about, 0, {_y: 10 });

this works fine, bunt in de about movieclip there is a function that is called
setData (xmlfile , cssfile) i want to call to fill the clip with the data provided in the funtion but i can not figure out how to call the function in the about

tia
sven