>Hi,
> Yes, I have Close capability with top level. User could close my top level from menu, toolbar and "x" button. I only do not place close button in most MDIForm....
>
>>>Also, if you're using modals in the TL, I suggest removing the min/max buttons.
>
> My I don't have modal form in TL. The normal form only cause my problem....

Hmmm...I think what you're referring to is normal MDI behavior. The usual solution (I think) would be to make at least one or more of the forms non-MDI.