The was finding out about the thread, and I Notice that if you call a form from the mainform you can send back parameter, but if you call a form from another form that is not the mainform that Unigui autocreate You can't send parameters from the called form to the caller form.
I think that must be a property or something like that in order to put the same properties to the other forms that aren't mainform.
Thanks everybody for your help, But I hope to get the way to send parameter back from another form