YS Ryu

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I found solution. I'm working on laptop. There is 2 graphic card. Internal : Intel Xe Graphics External : Nvidia MX450 Default is using internal graphic card. In Nvidia Control...

https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/blob/2a38b2c70a5e851bc5b926e0641c1848e719d86b/MaterialDesignThemes.Wpf/DialogHost.cs#L772-L786 In FocusPopup() method, sometimes **ui.IsVisible** is **false**. So **focusable** is null. So **focusable.Focus()** not excuted. `var focusable = child.VisualDepthFirstTraversal().OfType().FirstOrDefault(ui => ui.Focusable && ui.IsVisible);` So I made temporary way wait...