highlighted menu

Question

Hi, I have two menu groups; MainMenu and EditMenu. MainMenu includes: New, Edit, Delete, ... and EditMenu includes: Save and Cancel. the current menu is MainMenu. when user clicks on New menu, I change the menu to EditMenu. when user clicks on Save or Cancel, I change the menu back to MainMenu. the problem : after exiting the EditMenu, when MainMenu appears, New is highlighted!!! C# keeps the highlighted on New and doesn't go away by itself. if I move my mouse over the menu, the highlight will be removed. why does C# keep this highlight on the menu? how can I remove this highlight after click handeling? ( I mean when user clicks on New, before showing the EditMenu, I remove the highlight from the New). thanks