https://www.devexpress.com/Support/Center/Question/Details/T246117
DesignMdiController.SetCommandVisibility(ReportCommand.NewReport, CommandVisibility.None);
DesignMdiController.SetCommandVisibility(ReportCommand.OpenFile, CommandVisibility.None);
DesignMdiController.SetCommandVisibility(ReportCommand.SaveAll, CommandVisibility.None);
DesignMdiController.SetCommandVisibility(ReportCommand.SaveFileAs, CommandVisibility.None);