Sometimes, you may want to add a new button to an existing Ribbon tab for Office documents when developing a VSTO (Visual Studio Tools for Office) Add-In. This article details the steps to achieve the same.
Short AnswerTo add a button to the existing tab of an Office application, change the OfficeId of Ribbon control to the Control name of the existing tab. The entire list of default Office control names can be found at this link.
Detailed Instructions
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