The best method to kill TIMER

[kunam]

i just code it by myself, to test my skill, but
thats why i make alot TTimer classes, i think if we put on SetTimer/OnTimer
it will break in all execution of TTimer not in the specific class that
execute a function that call Form.Close,
i just want to break at Form.Close when TTimer call this

First, not clearly know your meaning.
Secnod, What's your coding language?
Third,
if you can't use FORM.CLOSE event to stop the App Close.
Try HOOK MSG of your App.
WM_CLOSE

Well... if djneo's or grashalm_'s solution don't work, then I don't know what.
Try their solutions first, then come tell us the good news.

The key to kill the timer is in the cmp. (nop the call to exit)