How to load style for sub menu item of a menu item which is placed inside a context menu in wpf?

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How to load style for sub menu item of a menu item which is placed inside a context menu in wpf?
or tell me a solution to this scenario - : In a button click(not right click, only left click) a menu should appear with sub menus displayed when mouse over the main menu items.(Important All menu items should be loaded at run-time/dynamically

Actually i did it in this way and its working, 1. I created a button and in its click event i opened a context menu. 2. The context menu has menu-item with header and its item. 3. I applied style for context menu. output: this shows menu with correct style in button click and on mouse over sub menu is displayed. But the problem is the style is not applied to sub menu. i tried of assigning style to that menu item also, but its useless...

Pls suggests me some solutions.....
Thanks in advance