The base class for the form used to show the End-User Designer for a particular report.
public class XRDesignFormExBase :
Public Class XRDesignFormExBase
The XRDesignFormExBase class serves as a base for the XRDesignFormEx and XRDesignRibbonFormEx classes, which have become obsolete.
Instead, use the XRDesignForm and XRDesignRibbonForm classes, which are descendants from the XtraForm class.