[Solved] How to bind List to a DependencyProperty

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The Binding in the UserControl’s XAML should have the UserControl instance as its source object, e.g. like this:

<ListView ItemsSource="{Binding MessageList,
    RelativeSource={RelativeSource AncestorType=UserControl}}" />

Alternatively you could set x:Name on the UserControl and use an ElementName binding:

<UserControl ... x:Name="self">
    ...
    <ListView ItemsSource="{Binding MessageList, ElementName=self}" />
    ...
</UserControl>

Besides that you should usually not set the DataContext of the UserControl to itself (like DataContext = this;) because that would effectively prevent inheriting the DataContext from the UserControl’s parent element, which is necessary for an “external” binding to work, like:

<uc:RecentList MessageList="{Binding Messages}" />

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solved How to bind List to a DependencyProperty