Hello Sadanand Panzade,
Thank you for your cooperation.
Unfortunately, this cannot be accomplished at this phase of the development of the RadOutlooBar.
We logged this as a bug in our PITS
system where you will be able to view its status soon(OutlookBar:The items in the overflow button`s dropdown content cannot be styled).
We updated your points accordingly.
All the best,
the Telerik team
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