<dxpdf:PdfViewerControl x:Name="pdfViewer"
                        ShowStartScreen="True"
                        CommandBarStyle="Ribbon">
    <dxpdf:PdfViewerControl.CommandProvider>
        <dxpdf:PdfCommandProvider>
            <dxpdf:PdfCommandProvider.RibbonActions>
                <!--Remove Hand Tool and Select All items-->
                <dxb:RemoveAction ElementName="{x:Static dxpdf:DefaultPdfBarManagerItemNames.HandTool}"/>
                <dxb:RemoveAction ElementName="{x:Static dxpdf:DefaultPdfBarManagerItemNames.SelectAll}"/>
                <!--Add new Save As item-->
                <dxb:InsertAction ContainerName="{x:Static dxpdf:DefaultPdfBarManagerItemNames.ContextMenu}">
                    <dxb:InsertAction.Element>
                    <dxb:BarButtonItem Content="Save" LargeGlyph="{dx:DXImage Image=SaveAs_16x16.png}"
                        Command="{Binding ElementName=pdfViewer, Path=SaveAsCommand}"/>
                            </dxb:InsertAction.Element>
                </dxb:InsertAction>
            </dxpdf:PdfCommandProvider.RibbonActions>
        </dxpdf:PdfCommandProvider>
    </dxpdf:PdfViewerControl.CommandProvider>
</dxpdf:PdfViewerControl>

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:PopupMenuShowing"
        xmlns:dxpdf="http://schemas.devexpress.com/winfx/2008/xaml/pdf" x:Class="PopupMenuShowing.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <dxpdf:PdfViewerControl x:Name="viewer"
                                PopupMenuShowing="Viewer_PopupMenuShowing"/>
    </Grid>
</Window>

using System.Windows;
using DevExpress.Xpf.PdfViewer;
using DevExpress.Xpf.Bars;

namespace PopupMenuShowing {

    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();

            // Load a document.
            viewer.OpenDocument("..\\..\\Demo.pdf");
        }

        private void Viewer_PopupMenuShowing(DependencyObject d, PopupMenuShowingEventArgs e) {

            // Remove the Hand tool item from the page context popup menu.
            RemoveAction removeHandTool = new RemoveAction();
            removeHandTool.ElementName = DefaultPdfBarManagerItemNames.HandTool;
            e.Actions.Add(removeHandTool);

            // Remove the Select All item from the page context popup menu.
            RemoveAction removeSelectAll = new RemoveAction();
            removeSelectAll.ElementName = DefaultPdfBarManagerItemNames.SelectAll;
            e.Actions.Add(removeSelectAll);

            // Insert the "Save As..." item that invokes the Save As dialog.
            BarButtonItem barButtonItem = new BarButtonItem();
            barButtonItem.Content = "Save As...";
            barButtonItem.Command = viewer.SaveAsCommand;
            InsertAction insertBarButtonItem = new InsertAction();
            insertBarButtonItem.ContainerName = DefaultPdfBarManagerItemNames.ContextMenu;
            insertBarButtonItem.Element = barButtonItem;
            e.Actions.Add(insertBarButtonItem);
        }
    }
}

Imports System.Windows
Imports DevExpress.Xpf.PdfViewer
Imports DevExpress.Xpf.Bars

Namespace PopupMenuShowing

    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()

            ' Load a document.
            viewer.OpenDocument("..\..\Demo.pdf")
        End Sub

        Private Sub Viewer_PopupMenuShowing(ByVal d As DependencyObject, ByVal e As PopupMenuShowingEventArgs)

            ' Remove the Hand tool item from the page context popup menu.
            Dim removeHandTool As New RemoveAction()
            removeHandTool.ElementName = DefaultPdfBarManagerItemNames.HandTool
            e.Actions.Add(removeHandTool)

            ' Remove the Select All item from the page context popup menu.
            Dim removeSelectAll As New RemoveAction()
            removeSelectAll.ElementName = DefaultPdfBarManagerItemNames.SelectAll
            e.Actions.Add(removeSelectAll)

            ' Insert the "Save As..." item that invokes the Save As dialog.
            Dim barButtonItem As New BarButtonItem()
            barButtonItem.Content = "Save As..."
            barButtonItem.Command = viewer.SaveAsCommand
            Dim insertBarButtonItem As New InsertAction()
            insertBarButtonItem.ContainerName = DefaultPdfBarManagerItemNames.ContextMenu
            insertBarButtonItem.Element = barButtonItem
            e.Actions.Add(insertBarButtonItem)
        End Sub
    End Class
End Namespace

private void PdfViewer_PopupMenuShowing(DependencyObject d, DevExpress.Xpf.PdfViewer.PopupMenuShowingEventArgs e)
{
    e.Cancel = true;
}

Private Sub PdfViewer_PopupMenuShowing(ByVal d As DependencyObject, ByVal e As DevExpress.Xpf.PdfViewer.PopupMenuShowingEventArgs)
    e.Cancel = True
End Sub