I've got a relatively simple XAML:

<UserControl x:Class="BamlTest.UserControl1"
             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"           
             mc:Ignorable="d">
    <UserControl.Resources>
        <Style TargetType="Control" x:Key="baseStyle" />
    </UserControl.Resources>
    <Grid>
        <Grid.ContextMenu>
            <ContextMenu>
                <ContextMenu.Resources>
                    <Style TargetType="Control" BasedOn="{StaticResource baseStyle}" />
                </ContextMenu.Resources>
            </ContextMenu>
        </Grid.ContextMenu>
    </Grid>
</UserControl>

I compiled using VS 2012. However when decompiling the assembly, I get

System.ArgumentException: Cannot find StaticResource: 0
Parameter name: identifier
at Ricciolo.StylesExplorer.MarkupReflection.XmlBamlReader.GetStaticResource(Int16 identifier)
at Ricciolo.StylesExplorer.MarkupReflection.XmlBamlReader.ReadPropertyWithStaticResourceIdentifier()
at Ricciolo.StylesExplorer.MarkupReflection.XmlBamlReader.ProcessNext()
at Ricciolo.StylesExplorer.MarkupReflection.XmlBamlReader.ReadInternal()
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r)
at System.Xml.Linq.XContainer.ReadContentFrom(XmlReader r, LoadOptions o)
at System.Xml.Linq.XDocument.Load(XmlReader reader, LoadOptions options)
at ILSpy.BamlDecompiler.BamlResourceEntryNode.LoadIntoDocument(IAssemblyResolver resolver, AssemblyDefinition asm, Stream stream)
at ILSpy.BamlDecompiler.BamlResourceEntryNode.LoadBaml(AvalonEditTextOutput output)
at ILSpy.BamlDecompiler.BamlResourceEntryNode.<>c__DisplayClass3.b__1()