CreateThumbnail of ThumbnailFactory leads to InvalidOperationException: 'The calling thread cannot access this object because a different thread owns it.', when called from separate STA thread.

Add support for Date picker form field type so the user can pick a date through a date time picker.

This is Unicode (UCS-2) encoding for the Adobe-GB1 character collection.

Described on page 443 in Pdf Reference 1.7.

In Adobe and Foxit readers, the user can draw different shapes, which are later saved as images in the document.

User is not able to type in the form fields on touch devices.

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.