FNiagaraHierarchyRootViewModel ( [UNiagaraHierarchyItemBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\UNiagaraHierarchyItemBase) * InItem, [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< [UNiagaraHierarchyViewModelBase](API\Plugins\NiagaraEditor\ViewModels\HierarchyEditor\UNiagaraHierarch-_9) > InHierarchyViewModel, bool bInIsForHierarchy )