MainWindow.xaml

<Window x:Class="CustomizeReportDesignerToolbar.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core" 
    xmlns:dxr="http://schemas.devexpress.com/winfx/2008/xaml/ribbon" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:dxpbars="http://schemas.devexpress.com/winfx/2008/xaml/printing/bars"
    xmlns:dxrud="http://schemas.devexpress.com/winfx/2008/xaml/reports/userdesigner" 
    xmlns:dxb="http://schemas.devexpress.com/winfx/2008/xaml/bars"
    Height="350" Width="525" Loaded="Window_Loaded">
    <dxrud:ReportDesigner x:Name="reportDesigner">
        <dxrud:ReportDesigner.RibbonCustomizationActions>
            <dxb:RemoveAction ElementName="{x:Static dxrud:DefaultBarItemNames.SaveAs}" />
            <dxb:RemoveAction ContainerName="{x:Static dxrud:DefaultBarItemNames.DesignerPage}" 
                              ElementName="{x:Static dxrud:DefaultBarItemNames.FontGroup}" />
            <dxb:RemoveAction ContainerName="{x:Static dxrud:DefaultBarItemNames.PreviewPage}" 
                              ElementName="{x:Static dxpbars:DefaultPreviewBarItemNames.FileGroup}" />
            
            <dxb:InsertAction ContainerName="{x:Static dxrud:DefaultBarItemNames.ReportGroup}">
                <dxb:InsertAction.Element>
                    <dxb:BarButtonItem LargeGlyph="{dx:SvgImageSource Uri='/CustomizeReportDesignerToolbar;component/Images/Close.svg'}" 
                                       Content="Close Document" ItemClick="CloseDocumentButton_ItemClick"/>
                </dxb:InsertAction.Element>
            </dxb:InsertAction>

            <dxb:InsertAction ContainerName="{x:Static dxrud:DefaultBarItemNames.DesignerHomePage}">
                <dxb:InsertAction.Element>
                    <dxr:RibbonPageGroup Caption="Help" Name="CustomCommandsGroup" />
                </dxb:InsertAction.Element>
            </dxb:InsertAction>
            <dxb:InsertAction ContainerName="CustomCommandsGroup">
                <dxb:InsertAction.Element>
                    <dxb:BarButtonItem LargeGlyph="{dx:SvgImageSource Uri='/CustomizeReportDesignerToolbar;component/Images/About.svg'}"
                                       Content="About" ItemClick="AboutButton_ItemClick"/>
                </dxb:InsertAction.Element>
            </dxb:InsertAction>
        </dxrud:ReportDesigner.RibbonCustomizationActions>
    </dxrud:ReportDesigner>
</Window>