I am trying to use Mahapps ShowMessageAsync() to have a confirmation dialog for item in SimpleChildWindow. When trying to call the ShowMessageAsync() from the child window I get an exception.
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:i="http ...