If I use VS2013 theme, I get these errors in Visual Studio's Output Window:
System.Windows.Data Error: 40 : BindingExpression path error: 'RootDocument' property not found on 'object' ''LayoutDocumentFloatingWindow' (HashCode=36044558)'. BindingExpression:Path=Model.RootDocument.IsActive; DataItem='LayoutDocumentFloatingWindowControl' (Name=''); target element is 'LayoutDocumentFloatingWindowControl' (Name=''); target property is 'NoTarget' (type 'Object')

Please, fix this issue.