Use the attached project to reproduce.
Workaround:
var combo = toolbar.ChildrenOfType<PercentComboBox>().FirstOrDefault();
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.
Loading a document that contains big images could lead to OutOfMemory exception.
This exception is thrown because there is field name with special characters which are incorrectly modified during the recalculation process of widget appearances. This exception is thrown in the internal RecalculateMissingAppearances method or in RecalculateWidgetAppearancesOld method.
For some fonts the issue is present. Some of them are: KozGoPro-Medium KozMinPro-Regular KozGoPro-Bold
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.
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
FixedDocumentPresenter could be TemplateBound to PDFViewer's Background property. Available in LIB version: 2016.3.1205