beginFill problem with flash 8.. need little help in this guys

hello every body
i can’t coloring my MC i don’t know why
i made movie clip with instant name “my_mc”
am trying to change the color or fill it again with an other color but no hope
ummm
i used this

my_mc.beginFill(0xCCCCCC);
my_mc.endFill();

am i right in using this function to do what i want ??

fla attached with this post
regards :smiley: