Pedro,

Are you setting the form LockScreen anywhere?

>I have a form with one grid , two containers , and 5 text box .
>Everything works good .
>
>But , if i minimize , my aplication , when grid has focus , and work in windows , word for example , when i go back to my aplication , grid is blink , and the backcolor containers , is windows desktop . If i click in my form , everything works good .