I am developing a Windows Runtime application, and I would like to register a name for a child control (after Xaml parsing), just like I can do with WPF, using this method here:
Is this possible with Windows Runtime?
No, it doesn't exist. The WinRT API and the WPF are different.
https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.frameworkelement.Aspx