This tutorial illustrates how to customize a Report Designer's ribbon toolbar by adding a new button to it.
See the following tutorial to learn how to add a Report Designer to a WinForms application: Create a Custom End-User Report Designer.
Do the following to customize the toolbar of a ribbon-based designer form:
Click the button and add a new RibbonPageGroup to the toolbar.
Click the smart tag of the created page group and set its RibbonPageGroup.Text property to Help.
Click the button in the created group and select Add Button in the invoked context menu.
Handle the newly added button's BarItem.ItemClick event:
The following image illustrates the result: