Text.caption = +1 on enterframe

Hi all !
I have a dynamic text on my scene. this text is inside a MC.

inside my text MC i have add an action script layer with this code.

this.onEnterFrame = function () {
text.caption +=1
}

but, it doesnt work of course :smiley:

i would like when i launch my project, on enterframe, the caption of my text = +1.
i am really lost !!
Thanks for any help !
Bye.