For more information and a sample project please refer to this
forum post. The RadMenuItem uses ButtonChrome control for animating the visual states easily. You can find more information about styling the ButtonChrome in this
KB article.The link is for WPF but the statements remain true for Silverlight - the only difference is that in Silverlight we use VisualStates instead of Triggers.
Hope this information helps.
the Telerik team
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