>Hi,
>
>While a form's timer is running a long process, is it possible to click on a checkbox in order to tell the timer to stop, or any workaround to produce an event and to be able to stop it ?
>
>I have been trying different things with doevents and autoyield property but the form does not respond to 'Clicks'
>
>Thanks
>Juan C. Jaramillo

Put DOEVENTS amoung the long process.

procedure mycheckbox.Click
   thisform.mytimer.Enabled = this.Value
endproc 

Procedure mytimer.Timer
   * long processing code
   DOEVENTS FORCE && this wouldn't be executed until the previous command is complete
   * other code
Endproc

HTH