Wiring UI

Updated on Mar 4, 2026

RadPdfViewer provides commands and respective command descriptors that you can easily bind to when creating UI. They are available via the CommandDescriptors property of the control. This allows you to bind the command descriptors to any UI element that supports commanding, such as Button, MenuItem, RadButton, RadMenuItem, etc.

Default Command descriptors

The commandDescriptors collection of RadPdfViewer is predefined with a set of default command descriptors. Each command descriptor corresponds to a specific command that the RadPdfViewer supports. These commands include actions such as opening a PDF document, navigating through pages, zooming in and out, and more.

Each command descriptor provides a Command property that you can bind to the Command property of your UI element.

The CommandDescriptors object exposes the following command descriptors:

• OpenCommandDescriptor—Opens a PDF document in the viewer.
• SaveAsCommandDescriptor—Saves the current PDF document to a specified location.
• PageUpCommandDescriptor—Navigates to the previous page in the document.
• PageDownCommandDescriptor—Navigates to the next page in the document.
• ZoomInCommandDescriptor—Increases the zoom level of the document.
• ZoomOutCommandDescriptor—Decreases the zoom level of the document.
• PrintCommandDescriptor—Prints the current PDF document.
• CopyCommandDescriptor—Copies the selected text to the clipboard.
• SelectAllCommandDescriptor—Selects all text in the document.
• MoveCaretLineDownCommandDescriptor—Moves the caret down one line in the text.
• MoveCaretLineUpCommandDescriptor—Moves the caret up one line in the text.
• MoveCaretToStartOfDocumentCommandDescriptor—Moves the caret to the start of the document.
• MoveCaretToEndOfDocumentCommandDescriptor—Moves the caret to the end of the document.
• MoveCaretToLineStartCommandDescriptor—Moves the caret to the start of the current line.
• MoveCaretToLineEndCommandDescriptor—Moves the caret to the end of the current line.
• MoveCaretToNextWordCommandDescriptor—Moves the caret to the next word in the text.
• MoveCaretToPreviousWordCommandDescriptor—Moves the caret to the previous word in the text.
• MoveCaretToNextCharacterCommandDescriptor—Moves the caret to the next character in the text.
• MoveCaretToPreviousCharacterCommandDescriptor—Moves the caret to the previous character in the text.
• ShowFindDialogCommandDescriptor—Displays the find dialog for searching text in the document.
• FitToWidthCommandDescriptor—Adjusts the zoom level to fit the page width to the viewer.
• FitToPageCommandDescriptor—Adjusts the zoom level to fit the entire page to the viewer.
• FindCommandDescriptor—Finds the next occurrence of the specified text in the document.
• FindPreviousCommandDescriptor—Finds the previous occurrence of the specified text in the document.
• RotateClockwiseCommandDescriptor—Rotates the document 90 degrees clockwise.
• RotateCounterClockwiseCommandDescriptor—Rotates the document 90 degrees counter-clockwise.
• SetFixedDocumentPagesPresenterCommandDescriptor—Sets the document presenter to pages view mode.
• SetFixedDocumentSinglePageViewPresenterCommandDescriptor—Sets the document presenter to single page view mode.
• FitToPageFixedDocumentSinglePageViewPresenterCommandDescriptor—Adjusts the zoom to fit the page when in single page view mode.
• FitToWidthFixedDocumentPagesPresenterCommandDescriptor—Adjusts the zoom to fit the page width when in pages view mode.
• ActivateBookmarkItemCommandDescriptor—Activates a bookmark item and navigates to its destination or executes its action.
• SyncCurrentBookmarkItemCommandDescriptor—Synchronizes the current bookmark item with the viewer's current position.
• ValidateSignaturesCommandDescriptor—Validates all digital signatures in the document.
• ShowSignaturePropertiesDialogCommandDescriptor—Displays the properties dialog for a selected signature.
• ShowSignSignatureDialogCommandDescriptor—Displays the dialog for signing a signature field.
• SignSignatureCommandDescriptor—Signs a signature field in the document.
• MoveDownCommandDescriptor—Moves down in the document (moves caret down in text selection mode or scrolls down in pan mode).
• MoveUpCommandDescriptor—Moves up in the document (moves caret up in text selection mode or scrolls up in pan mode).
• MoveRightCommandDescriptor—Moves right in the document (moves caret right in text selection mode or scrolls right in pan mode).
• MoveLeftCommandDescriptor—Moves left in the document (moves caret left in text selection mode or scrolls left in pan mode).

Find a runnable project showing RadPdfViewer in the WPF Samples GitHub repository. The project is wired to work with RadToolBar and RadContextMenu. You can note how the DataContext of the toolbar is bound to the instance of RadPdfViewer on the same page.