(TWincontrol property).Showing doesn't work properly

Hello all,
        Supposed that I have a form containing a panel and an edit box
contained in the panel . Once I invoked HIDE method of that panel ,
the property SHOWING of the edit box should be automatically set to
false . But the fact is not as I wish , that property is set to true
by Delphi. What's wrong ? Please tell me .
                                                        Cholwich N.