KeyDown Issue

[gridman]

Hi,

I am trying to make a Grid respond to KeyDown but is perplexed by the behavior.

1. In the following, KeyDown function of the Grid does not trigger.
2. Adding a Button, KeyDown function starts to trigger.
3. Clicking on anywhere of the Grid (not on the Button) causes the KeyDown to stop triggering.
4. Clicking back on the button (bringing Focus), makes the KeyDown starts triggering again.

If I just want my Grid with a simple background color without any children to respond to KeyDown, what is the correct way to do it? Or am I missing something above? Thanks in advance.

<Window
x:Class="App1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App1"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
>
<Grid x:Name="mainGrid" KeyDown="Grid_KeyDown" Background="Blue">
<!--
<Button x:Name="Hello" Click="Hello_Click">Test
-->
</Grid>
</Window>

Code Behind

   private void Grid_KeyDown(object sender, KeyRoutedEventArgs e)
   {
        System.Diagnostics.Debug.WriteLine("Grid Key Down");
   }

Windows 11 with Windows App SDK 1 Preview 3