Unexpected items were obtained in a subclass of ItemsControl about microsoft-ui-xaml HOT 5 CLOSED

I tested it to be an ownerType issue. I get the result I want when the ownerType of VisibleDockablesProperty is DocumentDock. Is there a good way to handle the ownerType of VisibleDockablesProperty in the inheritance chain?

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@GochenRyan I'm having trouble understanding the issue. can you explain a bit more/provide a repro project that is scoped to the problem you are facing?

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@ranjeshj
I want to use the ContentTemplateSelector of ContentControl and the ItemTemplateSelector of ItemsControl to generate the corresponding custom controls step by step according to the node tree of xaml here：

<local1:DockControl>
    <models:RootDock>
        <models:RootDock.VisibleDockables>
            <models:DocumentDock>
                <models:DocumentDock.VisibleDockables>
                    <models:Document x:Name="Document1" Title="Program.cs">
                        <TextBlock Text="{Binding Title}"/>
                    </models:Document>
                    <!--<models:Document x:Name="Document2" Title="App.axaml">
                        <TextBlock Text="{Binding Title}"/>
                    </models:Document>-->
                </models:DocumentDock.VisibleDockables>
            </models:DocumentDock>
        </models:RootDock.VisibleDockables>
    </models:RootDock>
</local1:DockControl>

When creating a RootDockControl, its Items are not just the next level nodes.

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@ranjeshj Actually I have a solution. I created a new branch fix-containerdp and fixed this issue in commit 9b43b77802fdb0e097ce09c8f9e7aeefe27b43f8. In short, by putting the container dependency property at the last level of the inheritance chain. But I don't know why the container dependency property needs to be handled specially.

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@ranjeshj My fault. I misunderstood the usage of Collection-type dp. FYI: https://learn.microsoft.com/en-us/windows/uwp/xaml-platform/custom-dependency-properties#collection-type-dependency-properties.

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