>Thank you
>
>I thought variables were supposed to be valid while in the same form
>
>I used to declare them in init method and release them in
>release method
>
>But sometimes I forget to release them
>
>Moises

No, any method or event in the form is a single program routines . So variable scopes are valid as in other ones:
LOCAL until that code is visible and not for any other routines executed in it.
PRIVATE until that code is visible and for every other routines executed in it.
PUBLIC for every other routines executed in it and after it until that variable is released.