I inserted the xaml below in the WPF EditControlXamlDemo. The outline for the element is missing? xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ms="clr-namespace:System;assembly=mscorlib" xmlns:go="clr-namespace:GO.Windows;assembly=GO.Windows" xmlns:my="clr-namespace:GO.Plugin;assembly=GO.Plugin" > Load a new xaml file