This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
Widgets in retainer boxes cannot use drag feature
Regression (No) issue (does) occur in 4.11.2
Box does not drag out
Additional box is created and drug around at mouse location.
Head over to the existing Questions & Answers thread and let us know what's up.