I'm using RadSpreadsheet recently to deal with Excel and CSV files. But I found my RadSpreadsheet control has no FormatProviders property and I could not register XlsxFormatProvider and CsvFormatProvider. Seems I've added all the references required and reset the Theme file. Is there anything I ignored? My Telerik Controls Version is Ver. 2017 Q1, is that low version a suspicious cause for the problems?
Here's my XAML snippet: