Hi Veeningen,
Query1: Accordion not Displayed.
We are unable to reproduce the reported problem. If sdk reference not used, please try adding assemblies from the following folder location.
For Assemblies Referrnces,
$SystemDrive\Program Files (x86)\Syncfusion\Essential Studio\11.2.0.64\Assemblies for winRT\
Query2: SfRating Assembly
The SfRating control is embedded in the Syncfusion.SfInput.winRT dll. We have prepared a simple sample to load SfRating control with assembly reference.
Please find the sample in below link,
Please let us know if you have any queries.
Regards,
Vignesh V