Setting property of duplicated component?

hi there, ive got a radiobutton component on my stage named radio1.
I need to duplicate it and then change a few properties, but i cant seem to get the path/naming right. This is my code:


i=2;
radio1.duplicateMovieClip("radio"+i, radio1.getNextHighestDepth(), {_x:20, _y:20});
_root["radio"+i].setLabel("test");
i++

if i use a constant name instead of “radio”+i it works but the [“radio”+i] seems to be the problem, could someone help me with this? (using flash mx)