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PDF Viewer Navigation Pane

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The Navigation pane displays thumbnails, bookmarks, attachments, and annotations. Click the corresponding tab in the pane to open or close the built-in panel.


Built-In Panels


This panel displays bookmarks from the PDF file.


The Options drop-down list shows bookmark settings.


The table below describes the bookmark settings and lists the API used to specify the corresponding options in code.

Option Description API
Expand Current Bookmarks Expands the selected bookmark. PdfOutlinesExpandCurrentCommand
Collapse/Expand Top-Level Bookmarks Expands or collapses all bookmarks. PdfOutlinesExpandCollapseTopLevelCommand
Hide After Use Specifies whether to hide the panel after an outline was clicked. PdfOutlineViewerSettings.HideAfterUse
Text Size Gets or sets the size of bookmark nodes. PdfOutlineViewerSettings.TextSize
Wrap Long Bookmarks Specifies whether to wrap long bookmark names. PdfOutlineViewerSettings.UseOutlinesForeColor


This panel displays the list of file attachments in the current PDF file.


When you open an attachment, the Security Warning message appears. Handle the PdfViewer.FileAttachmentOpening event to hide the message box.



The Page Thumbnails panel displays page thumbnails.


The Options drop-down list shows thumbnail settings. This list can also be accessed from the panel’s context menu.


Option Description Command
Print Page(s) Invokes the Print dialog to print pages that correspond to the selected thumbnails. If the panel contains no selected thumbnails, all the pages are printed. PdfThumbnailsPrintPagesCommand
Enlarge Page Thumbnails Increases page thumbnail size. PdfEnlargePageThumbnailsCommand
Reduce Page Thumbnails Decreases page thumbnail size. PdfReducePageThumbnailsCommand

You can use the zoom slider or Ctrl+Mouse Wheel shortcut to enlarge/reduce thumbnails.



The Comments panel displays annotations and comments.


You can sort and filter comments by page, author, date, type, check and review status.

Click an annotation to add a reply to it. Double-click the annotation to edit its contents.

Edit and Reply

Right-click the annotation and select Set Status to specify the review status. Select None to remove the status.

Click on the checkbox at the comment’s top right corner to flag the comment with a check mark. Check marks are for your personal use, for example, to mark the comment as reviewed. They do not specify whether to print or export the selected comments.


The PDF Viewer ships with the following API used to customize the navigation pane:

Action Properties Events
Change the pane’s visibility PdfViewer.NavigationPaneVisibility
Display only specific panels PdfViewer.NavigationPanePageVisibility
Change active page PdfViewer.NavigationPaneInitialSelectedPage
Specify the pane’s width PdfViewer.NavigationPaneWidth
See Also