menu item visibility problem

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C#

C#4.0

hi to all!

here is a little problem in my project i created a form with the name "Form1"

and have a menu strip in the name "menustrip1"

and has a main menu in the name "Functions"

and have sub menus

"F1" default visibility false and modifiers is public

"F2" default visibility false and modifiers is public

"F3" default visibility false and modifiers is public

"F4" default visibility false and modifiers is public

and a function public void dispaly

where i set f1, f2, f3, and f4 visibility true

i debug it its executing all the statements but acctually visibility dosent change

i dont understand whats the problem