virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnDroppedOnRow ( const [FDragDropEvent](API\Runtime\SlateCore\Input\FDragDropEvent) & DragDropEvent, EItemDropZone ItemDropZone, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNiagaraHierarchyItemViewModelBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\FNiagaraHierarch-_6) > Item )