Webview2 embedded inside wpf application focus issue

We have integrated webview2 in my wpf application. In that application we have a Iframe child window with a drop down for which we want to handle the preview key down event by keeping the e.handled as true. But we noticed that webview2 does not provide focus to child window, and to explicitly set focus we have to use thread sleep which is hitting the performance.

We have attached web and wpf application for more information. Steps to reproduce the issue :

1. Host the web application(websample) on IIS manager locally.
   How to host:
   -Open webSample in visual studio in administrator mode
   -Right click on project and click on publish
   -Now update it to release mode and publish it locally
   -Click on publish
2. Open IIS manager and right click on sites and click on add website
3. Assign some site name and also assign the same published local path in physical pàth text box
   Also, make sure the port no. Is 8081
4. Run the wpf application in admin mode
5. On main window click on Open iframe button
6. Now you can see iframe child window which doesn't get focus and also, end key won't work for drop down after making e.handled as true .

WebView2_WPF_Sample (2).zip
WebSample.zip

AB#40348800