There is a few problems with this, for one AMS is Window Form based, for two your using the timer page a little wrong I see so many posts like this.
On Timer is ID based so start your timer and then check for timer
Code
--On Show
--Page.StartTimer(TIME_IN_MILLSEC, TIMER_ID);
Page.StartTimer(10, 15);
--On Timer
if e_ID == 15 then
-- Do Action
end
This lets you use many timers at once, don't go crazy as AMS been single threaded but that is how you would do it.