How do I add a needDataSource to a report in Visual Studio

[Jonathan]

I have a WPF report and I don't know how to add a NeeDataSource to it. When I select the report (blue box in top left corner of designer) I see that there is a NeedDataSource setting in the properties box (the "lightning bolt" icon is selected), but when I click on the dropdown it is empty. Please advise how to add a NeedDataSource to it. Thank you. Jon

[Jonathan]

This was resolved. Not sure if I restarted Visual Studio or what, but I was eventually able to add a NeedDataSource.