Ribbons have been replaced by a command bar in CRM 2013. You can customize the Dynamics CRM command bar to add custom buttons. The command bar provides a new way of displaying buttons and provide better performance. There are two main places where Ribbons (command bar) are located:
Adding a simple button to the command bar involves touching the customization file to include nodes in the RibbonDiffXml node, adding web resources for the images to be displayed in the button, and adding a web resource for the ...