>But wait...
>It works in clicking "X" in the form but not when Ctrl+F4 is pressed...
>
>Thanks

Hi,

If, in addition to NODEFAULT, you return .F. from QueryUnload, the form cannot be closed by Ctrl+F4, clicking on the close button, or the ControlBox menu. Generally, the code looks something like:

IF NOT SomeLogicalCondition && or IF SomeLogicalCondition
  NODEFAULT
  RETURN .F.
ENDIF