This sample show cases how to set the image to Ribbon Button in WPF Ribbon control.
The WPF Ribbon control accommodates all the tools required for an application in a single, easy-to-navigate user interface like Microsoft Office. The built-in ribbon buttons provide basic functionalities like normal button and facilitates different options to customize ribbon button image size and its content.
KB article - How to set the image to Ribbon Button in WPF Ribbon control?