BladeView isn't exposed correctly in UI Automation tree

[jamesmcroft]

Describe the bug

A clear and concise description of what the bug is.

When querying the BladeView and BladeItem controls using a tool for analyzing the UI Automation tree, the hierarchy of the UI is not rendered correctly making it difficult to automate UI tests.

• Is this bug a regression in the toolkit? If so, what toolkit version did you last see it work:

NuGet Package(s):

• Uwp.UI.Controls

Package Version(s):

• 6.1.1

Windows 10 Build Number:

• Fall Creators Update (16299)
• April 2018 Update (17134)
• October 2018 Update (17763)
• May 2019 Update (18362)
• May 2020 Update (19041)
• Insider Build (build number: )

App min and target version:

• Fall Creators Update (16299)
• April 2018 Update (17134)
• October 2018 Update (17763)
• May 2019 Update (18362)
• May 2020 Update (19041)
• Insider Build (xxxxx)

Device form factor:

• Desktop
• Xbox
• Surface Hub
• IoT

Visual Studio

• 2017 (version: )
• 2019 (version: 16.7.4)
• 2019 Preview (version: )

[ghost]

Hello jamesmcroft, thank you for opening an issue with us!

I have automatically added a "needs triage" label to help get things started. Our team will analyze and investigate the issue, and escalate it to the relevant team if possible. Other community members may also look into the issue and provide feedback 🙌