Problem with scrollbar in dynamic text

programming flash
1

hi!

so i have a dynamic text that only let me scroll it for 1 or for -1.

1 dynamic text instanced loadedInfo
1 button to go up instanced ScrollUp
1 button to go down ScrollDown

1 st frame code



root.scrollDown.onPress = function() {
    loadedInfo.scroll += 1;
}
_root.scrollUp.onPress = function() {
    loadedInfo.scroll -= 1;
}

i even have used components croll bar and same thing happens, it detect there is a lot of text but only let me scroll +1 or -1

http://pwp.netcabo.pt/mauroalexandre/swf.zip