The exception is thrown during "Put" operator execution.

Telerik.Windows.Zip.InvalidDataException for unknown (0xAD) compression method is thrown for some object streams.

The widgets of the interactive forms are not respected when creating a thumbnail from a PDF page. Implement logic for adding the form fields widgets to the generated image as well.

Visualizing a page with a huge number of images (40000) freezes the application.
When switching to the FixedDocumentSinglePageViewPresenter, all the page content should be loaded so it can be later rendered. Although the images are loaded asynchronously, there are too many threads started which seems to cause the hang. Also, according to profiling results, it seems like the image caching causes performance diminishments in such scenarios. 

Add support for respecting Custom UI Layers when exporting Fixed Page to an image.

When importing the document as DocumentSource the stream will be loaded asynchronously and the document won't be loaded when the Print() method is called, NullReferenceException is thrown.

Use the attached project to reproduce. 

Workaround:

var combo = toolbar.ChildrenOfType<PercentComboBox>().FirstOrDefault();

var binding = new System.Windows.Data.Binding();
binding.Path = new System.Windows.PropertyPath("ScaleFactor");
binding.Mode = System.Windows.Data.BindingMode.TwoWay;
binding.Source = pdfViewer;
binding.UpdateSourceTrigger = System.Windows.Data.UpdateSourceTrigger.PropertyChanged;
BindingOperations.SetBinding(combo, PercentComboBox.ValueProperty, binding);

var binding1 = new System.Windows.Data.Binding();
binding1.Source = pdfViewer;
BindingOperations.SetBinding(combo, PercentComboBox.RadPdfViewerProperty, binding);

To reproduce:

- Search for a specific word until the last occurrence is found and a message appears. 

- Click the FindPrevious button

Result: A message appears.

Expected: The previous entry is selected. 

Whitespaces are ignored when copy-pasting from PdfViewer to another text redactor.

Document with invalid cross-reference stream is not loaded correctly

There is an exception when the destination is pointing to a page array. This should be handled so the document is displayed. 

WPF controls are used to visualize the form fields in PdfViewer. However, these controls inherit the background defined in the PdfViewer's theme instead of a background of the form field control. This leads to wrong visualization mostly in the dark themes as the content inside the form field might get unreadable.

When RadPdfViewer is created on UI thread different than the Application main thread, an InvalidOperationException: 'The calling thread cannot access this object because a different thread owns it.' is thrown when calling the Copy method.

The character is visualized as '3'. The same issue is also reproducible when the content is copied from Adobe.

Right now an exception is not raised for gruop3 2d encoding.

When a pdf/a compliant document is opened in Adobe, there is a bar saying that the document is compliant with the standard. Expose such functionality in PdfViewer as well.

When the FixedDocumentSinglePagePresenter content control is used to visualize PDF files in custom PDF viewer implementation a raise condition can be occurred leading to NullReferenceException with the following stack trace:
at Telerik.Windows.Documents.Fixed.UI.UIElementsHelper.FillPageContentElementsInPanel(Canvas container, RadFixedPage page)
at Telerik.Windows.Documents.UI.FixedDocumentSinglePagePresenter.CreateContent(RadFixedPage page)
at Telerik.Windows.Documents.UI.FixedDocumentSinglePagePresenter.PageLoader_WorkCompleted(Object sender, WorkCompletedEventArgs e)
at Telerik.Windows.Documents.Utilities.ResourceLoader.OnWorkCompleted(WorkCompletedEventArgs args)
at Telerik.Windows.Documents.Utilities.ResourceLoader.Worker_RunWorkerCompleted(Object sender, RunWorkerCompletedEventArgs e)
at System.ComponentModel.BackgroundWorker.OnRunWorkerCompleted(RunWorkerCompletedEventArgs e)
at System.ComponentModel.BackgroundWorker.AsyncOperationCompleted(Object arg)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

The exception is thrown since the current page is unloaded while the content is being parsed.

They are used by the page and the XObjects drawn on it and deal with the overlaying of the colors. These groups are described on page 556 of PdfReference 1.7. 

This happens only in scenarios when the widget has On state appearance defined and Off state appearance missing. If both appearances are missing then RadPdfViewer recalculates the appearances and the checkbox is successfully selected and deselected.

I want to draw the signature box, like in Adobe Acrobat Reader.

This is very important when the document needs more than 1 signature.