This event is raised when the state of the report currently being edited in the Design Panel (assigned to the XRDesignFormExBase.DesignPanel property) has been changed. This report can be accessed via the XRDesignPanel.Report property. This can occur, for instance, when a report is loaded into the End-User Designer, or when it has been saved. All the report states available are listed in the ReportState enumeration.
In most cases, you don't need to manually handle the ReportStateChanged event, because this is done automatically.