Alright, thanks for your help. I'm getting very close to what I want by using HeaderedItemsControl, with a default Style. The key was that I was unaware that you could provide ItemsControl with content in XAML like this and of the existence of ItemsPresenter.

There's no data collection involved, just the XAML - in my example, two TextBlocks. Note that they would not necessarily be two, and not necessarily TextBlocks, and not necessarily the same as each other. Basically, I want to be able to use it just like I would a StackPanel. Can I use an ItemCollect...

I spent some time last week trying to write a subclass to UserControl which accepts XAML children - a sort of custom StackPanel which allows me to add a header and frame the contents as I like. What I want is to be able to do is something like the following <MultiContentControl> <TextBlock Text=&quo...