>I have only one top form.
>the timer is on the top form.
>I create oapp object on my start app with property, then I add timer on the top form that check the property and I can change the property any child form.
Well, then, I don't see any problem. Add the property to oApp (I'll call it oTopoForm), then assign the main form to this property. This can be done within the form itself:
oApp.oTopForm = ThisForm. I suppose this can also be done from outside, the moment you instantiate the form, although I didn't try this with properties:
do form TopForm name oApp.oTopForm.
After that, you can access the top form through the application object, for example:
oApp.oTopForm.MyTimer.Interval = ...
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