lookless

I am using Caliburn.Micro I have this WPF View that in design time uses sample data successfully on basic properties like firstname etc but can't won't find the view for properties and collections of complex types <UserControl x:Class="NonRepositoryItems.Reviewer.ReviewerView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:Controls="clr-namespace:MyFramework.Controls.BusyIndicator