Radiobutton duplication problems (easy)

Hi, i have one radiobutton component on my stage, which i wish to duplicate via actionscript. After that it needs to set the label etc. here is my code:
(radio1 is the radiobutton on my stage)


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

the only problem i have is the naming of the movie and then editing its properties. I found this [“radio”+i] but it doesnt seem to work. What is the proper way to do this?