WPF Find window instance

Question

I have created an instance of a window inside a class, but I am unable to access the instance of the window from my other class directly.

Is there a way to reference

Answer 1

System.Reflection.Assembly assemby = System.Reflection.Assembly.GetExecutingAssembly();
System.Type[] types = assemby.GetTypes();
var varWindows = types.ToList()
    .Where(current => current.BaseType == typeof(Window));
MessageBox.Show(varWindows.Count().ToString());

Application.Current.Windows gets us all instantiated windows, but the above code get us all windows.