thnks for the reply,

i was trying that way but doesn't works , i think i'm making something wrong with the "&" and the root minutes, i cannot fix it.

just works in a simple way , but i need add another minute and hour time values:

if ((_root.Hour >=12) && ( _root.Minutes <30)) {
setProperty(this, _alpha, 100);
}
else {
setProperty(this, _alpha, 0);
}
}