Does anyone know how to style the background property of a WPF ComboBox when a mouse is hovering on top of it?

I cannot get rid of the blue-ish button like background off the ComboBox.
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It will not work.Its because of the default control template of ComboBox.You may need to override the default template for this behavior.Have a look at
MouseOver highlighting style returning to default after a second (Caused by Aero?)
http://social.expression.microsoft.com/Forums/en/blend/thread/b210978c-24e8-431b-916b-a40a752b990c
http://social.msdn.microsoft.com/Forums/en/wpf/thread/a18891e9-8879-4819-9679-247341782f60