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Ordinarily I wouldn't just post an error message on SO, but after a Google search only found one hit, I thought I'd at least open the floor for this error here on SO. I have a custom control called Sparkline with a dependency property called Values of type unit[] . Here's an example where I use it in a DataTemplate : <DataTemplate DataType="{x:Type Activity:ActivityHistory}"> <Controls:Sparkline Grid.Column="1" Values="{Binding Path=Values}" /> </DataTemplate> This code doesn't compile. I receive the error message: Tags of type 'PropertyArrayStart' are not supported in template sections. The line/column numbers indicate the start of the Values attribute. This has really thrown me. Searching on Google returned one result where John_C hit exactly the same issue. Unfortunately, his solution involved moving the control to a separate assembly. Well, mine's already in a separate assembly. My guess is that something else is at play. I've never heard of PropertyArrayStart . Searching for that only return a few pages related to XAML serialisation. Interesting stuff, but not much help. Thinking about it, I can't think of any dependency properties in the framework that have array types. Is this allowed? I also tried using a nested element instead of a markup extension for the Binding . <DataTemplate DataType="{x:Type Activity:ActivityHistory}"> <Controls:Sparkline Grid.Column="1"> <Controls:Sparkline.Values> <Binding Path="Values"/> </Controls:

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