adding icon to menu item of Apption bar

I want to add image icon to application bar menu item without any text, so that it can appear as button . How can we add icon to menu item of application bar ?

Please provide a code snippet.
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Computer07Author Commented:
I am talking about the application bar menu items that appears as horizontal list of items when we expand the application bar . can we add image icon in that horizontal list of menu items or last of that list of menu items ??
Only for the visible row can you add icons. For the actual menu items you can only add text.

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