Hi Dinis,
Thanks for contacting Syncfusion support.
We have checked your query “DateTimePickerAdv control is not showing ToolBox in VisualStudio”. The DateTimePickerAdv has been changed as classic control and SfDateTimeEdit control is the advanced successor of DateTimePickerAdv, as a result it won’t be available in ToolBox in our upcoming releases. If you have already implemented DateTimePickerAdv in your application , you can continue to use them without issue. If you are creating a new application , we would suggest you to use SfDateTimeEdit control. Please refer the below documentation for same.
Note: For classic controls only bugs will be logged , no feature request will be accepted.
Regards,
Niranjan Kumar Gopalan