WPF call method parent from usercontrol
You'll need to cast the Window object to the specific window type you're using - which in your case is MainWindow:
MainWindow win = (MainWindow)Window.GetWindow(this);win.getList();However, it's not wise to have such coupling between the user control and the window it's hosted in, since that means you will only be able to use it in a window of type MainWindow. It would be better to expose a dependency property in the user control and bind the list to that property - this way the user control will have the data it requires and it will also be reusable in any type of window.
Solution from @Adi Lester is working but it break WPF coding ruler. Proper way of doing this is using event like in the linked answer belowhttps://stackoverflow.com/a/19384953/3099317