How to change the menu icon of mate desktop menu applet?

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http://askubuntu.com – I am using the Mate Desktop Environment v-1.4.1 and having a Mate-Menu applet in the bottom panel: Shutdown [ICON] Applications Places System. See screenshot below. Is there any way to change or remove the [ICON] on the left of the Applications menu? Where does Mate take this from? I noticed the inon changes when using different icon-themes but I don't understand how to customize only this single icon. (HowTos)