WPF allows running multiple UI threads in a single process. When RadPdfViewer is used in such scenarios, sometimes InvalidOperationException: 'The calling thread cannot access this object because a different thread owns it.' is thrown. 

Scenarios:
- Show Find dialog (or any other of the dialogs available for register in ExtensibilityManager class) for the first instance, the for the second instance.

Add support for importing and filling interactive forms.

Interactive Forms content is visualized read-only in RadPdfViewer UI with R1 2017 Release

Available in R3 2017 Official Release Version.

The exception is thrown with the message "Password is not correct" even when the user password is correct. This issue occurs for specific encryption algorithm parameters only.

This happens only in specific scenarios as most of the documents with annotations are visualized correctly.

This might result in invisible annotations.

The PdfViewer won't load a document from PdfDocumentSource created from Uri and the ReadOnDemand option.
Here is an example: new PdfDocumentSource(new Uri("webaddress/somefile.pdf"), FormatProviderSettings.ReadOnDemand);

Available in LIB Version 2017.1.130

The exception is thrown while decoding TIFF images. Although the document is properly loaded and the end user is not impacted, the DivideByZeroException is logged and present in the OnException event handler parameters. 

FixedDocumentPresenter could be TemplateBound to PDFViewer's Background property.

Available in LIB version: 2016.3.1205

The instances are kept in GeometryRenderer cache and each time the content stream is parsed new PathGeometry instances are added to GeometyRenderer store Dictionary field.

Available in R1 2017 Official Release Version.

This is not quite a valid PDF file scenario according to PDF file specification. However, we may try handling it in order to show the correct number of pages. When the kid is of type Pages, it should be added to the pages traversal recursion only the first time it is met.

Default RadPdfViewer presenters load image sources async which allows to render the rest PDF content faster. However, FixedDocumentSinglePagePresenter loads images syncrhonously and all page content is rendered right after all images on the page are loaded.

Setting DocumentSource throws NullReferenceException when PdfViewer is hosted in ElementHost. When setting the DocumentSource, the Application.Dispatcher is used, but in Winforms app, the Application is not instantiated. 

Steps to reproduce:
1. Host PdfViewer in ElementHost in a WinForms application
2. Set the DocumentSource property
3. Run
Expected: The document is opened
Actual: NullReferenceException is thrown

Workaround: the document could be set to the Document property of PdfViewer. Or instead hosting the PdfViewer for WPF in ElementHost, use WinForms version of the control.

Tint transformation function is used to transform Device N color in Alternate colorspace.

By using "Auto Detect Hyperlink" functionality RadPdfViewer should detect URLs and email addresses and turn them into hyperlinks. For instance if the PDF file contains text http://www.telerik.com/ this text should become a hyperlink.

Represents Free text PDF content.

Since LIB Version 2017.3.925 annotations of type FreeText can be visualized.

There is a similar question in FAQ for FontForge (https://fontforge.github.io/faq.html#mingliu) where it is described that kaiu.ttf (and probably mingliu.ttf) font does not store the correct outlines and its outlines need special treatment in order to be rendered correctly. The Chinese glyphs are rendered wrong in RadPdfViewer as well. However, Adobe Reader, FoxitReader and ChromeViewer render the glyphs correctly.

Currently, the disabling of the scrolling functionalities in PdfViewer is pretty tricky. Expose an API that allows users to control this functionality easier (hiding the scroll bars, disabling horizontal and/or vertical scrolling).

A sample of how the scrolling could be completely disabled is attached to this item.

This usually results in a single colored rectangle instead of a gradient filled rectangle.

Available in R1 2018 SP2 release version.

The ActionsManager.ExecuteUri method throws exception when tries to open relative Uri. As the exception is caught, with the current state no action is observed when interacting with such link in RadPdfViewer.