PdfViewer - throws NullReferenceException in GetPages method of PdfContentManager.

To reproduce:
- Just show and close a form that contains pdf viewer with a loaded document several times. 

To reproduce:
- Load a pdf file at the constructor and try to load another pdf file on Form.Load => the result is that the second pdf is not loaded.
 public Form1()
        {
            InitializeComponent();
            radPdfViewer1.LoadDocument("..\\..\\pdfSample.pdf");

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            radPdfViewer1.LoadDocument("..\\..\\test.pdf");
        }

Workaround: unload the first loaded document prior loading the second one

ADD. RadPdfViewer - add ability to show the document pages as thumbnails

Add rotate view button.

To reproduce: 
1. Drag and drop RadPdfViewer and RadPdfViewerNavigator
2. Load attached file from ticket
3. Click PrintPreview button from navigator and you will see that NullRefference exception is thrown. 

Workaround: 
You can set the ShowPrintPreview property to false of RadPrintViewNavigator
this.radPdfViewerNavigator1.ShowPrintPreview = false;

NullReferenceException when the document annotations are imported.

The RadPdfViewer throws ArgumentOutOfRangeException, when document is loaded.

Resolution: 
An exception message is shown when load the pdf document which contains unsupported encryption method. 

To reproduce:
When document that contain a specific formatting is imported there is some missing text.

PdfViewer - does not arrange correctly the layout of some pages.

If the document is using fonts that are not embedded and are not installed on client machine the text is not displayed.
 

1. Create a new project with RadPdfViewer. 

2. Try to load the pdf file from this ticket.

"Ñ" symbol is either rendered as a square, or it is not rendered at all.

To reproduce:
1.Load a document
2.Click the print button on the RadPdfViewerNavigator

Please refer to the attached gif file. The sample pdf file is attached as well.

To reproduce:
- Open the attached file with RadPdfViewer.