I think I figured it out. I used the Magellan Framework, which tried to register the controls in the view namespace URI. They did it so that you had to use the XML prefix on this control. This causes a problem with the Visual Studio 2012 XAML editor.
[assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "Magellan")] [assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "Magellan.Abstractions")] [assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "Magellan.Controls")] [assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "Magellan.Views")]
I removed this from the Properties\AssemblyInfo.cs Magellan file and it seems to have worked. I will check this answer if the problem does not occur.
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