Unfortunately, there is none today.
Please note that you cannot always sort dictionary entries alphabetically. As an example:
<Brush x:Key="B" />
<Style x:Key="A>
<Setter Property="Background" Value="{StaticResource B}" />
</Style>
If you sort this alphabetically, the application will not work as the resource declarations should appear before they are referred to using static resource extensions. In Blend, when you create a resource, we try out best to prevent you from getting into this state.
Thanks,
Unni
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