void AddElement ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FMLDeformerBonePickerTreeElement](API\Plugins\MLDeformerFrameworkEditor\FMLDeformerBonePickerTreeElement) > Element, [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FMLDeformerBonePickerTreeElement](API\Plugins\MLDeformerFrameworkEditor\FMLDeformerBonePickerTreeElement) > ParentElement )