Neither worked. Both crashed the editor - in the error log everything looks good up to the last two entries.
[2018.01.02-03.11.31:798][484]LogOutputDevice:Warning:
Script Stack:
ManagerBP_C.RetriveListOfItems
MainWidgetBP_C.ExecuteUbergraph_MainWidgetBP
MainWidgetBP_C.BndEvt__IndividualsButton_Button_K2Node_ComponentBoundEvent_526_OnButtonClickedEvent__DelegateSignature
[2018.01.02-03.11.31:802][484]LogWindows: Windows GetLastError: The operation completed successfully. (0)