Methods don't work on ViewModel (Prism.Forms)

[wollkopf]

I am working with Xamarin Forms and Prism.Forms and if I want to call Xam.Plugin.Webview methods like webview.InjectJavascriptAsync(..) or webview.OnContendLoaded += ... the methods aren't working, when i use my viewmodel (nothing happens), in the code behind the the methods are working fine.

Has anybody else experienced similar problems?