A11y_VSUserStory935073-ContainerToolsWindow_EnvironmentTab_Keyboard:Tab item(environment. ports, logs, files" gets activated without performing any action by the user.

Copied from VSO ID: 1029477

Bug Description:
“Check out Accessibility Insights! - Identify accessibility bugs before check-in and make bug fixing faster and easier.”

Environment Details:​
Application name-VS User Story 935073-Container Tools Window
Microsoft Visual Studio Enterprise 2019 Int Preview
Version 16.5.0 Preview 1.0 [29505.209.master]
OS: Win10

Repro Steps:​
1. Install and launch the Visual Studio2019 INT preview.
2. Create a project after checking the "Enable Docker Support" checkbox under "Advanced label".
3. Debug the solution using F5.
4. Navigate to View tab->other windows->Containers.
5. Navigate to the Environment tab.
6. Check the tab items "environment. ports, logs, files" gets activated without performing any action by the user.

Actual:
The tab items "environment. ports, logs, files" gets activated without performing any action by the user.

Expected:
The tab items "environment. ports, logs, files" should not get activate without performing any action by the user.

User Impact:
Keyboard only user get confused about the control.

Recommendations:​​
https://microsoft.sharepoint.com/teams/msenable/mas/Pages/browse-fixes.aspx
​
MAS Reference:
MAS 2.1.1:
https://microsoft.sharepoint.com/teams/msenable/_layouts/15/WopiFrame.aspx?sourcedoc={8492c4eb-c179-40ae-8777-cd044ed725a2}

MAS3.2.1:
https://microsoft.sharepoint.com/teams/msenable/_layouts/15/WopiFrame.aspx?sourcedoc={a4bbd37d-ee11-485e-b5c8-0539f0ac94b2}