WPF popup window's textbox not able to get input from keyboard when another application running in foreground

Hi I have create a normal popup window with textbox but textbox not taking any input when another process or application running on foreground of our Wpf window.

Step for reproduced 1.Launch application 2.Open popup window 3.Maximize window 4.Go to other application like window file explorer. 5.Try to type something on popup window

**sample program for popup window ** `<Window x:Class="WPFPopup.Window3" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WPFPopup" mc:Ignorable="d" Title="Window3" Height="450" Width="800"> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions>

    <Button x:Name="btn" Content="Open Search Window"  Height="30" Width="150" Click="btn_Click"/>

    <Popup x:Name="popup"  PlacementTarget="{Binding ElementName=btn}" Placement="Bottom"  Width="200" Height="100" Margin="0,20,0,0">
        <Border BorderBrush="Black" BorderThickness="2" Background="AliceBlue">
            <TextBox x:Name="txtBox" VerticalAlignment="Center" Margin="15,0,15,0"/>
        </Border>
    </Popup>

  
</Grid>

</Window> ` _**cs code**_ `using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes;

namespace WPFPopup { ///

/// Interaction logic for Window3.xaml ///

public partial class Window3 : Window { public Window3() { InitializeComponent();

    }
   
    private void btn_Click(object sender, RoutedEventArgs e)
    {
        popup.IsOpen = true;
    }
}

} `

[pchaurasia14]

Thanks @lindexi 👍

[sachinkumarrajak]

@sachinkumarrajak Could you try my demo code: https://github.com/lindexi/lindexi_gd/tree/1666e742fbd5ebda36e840a8e5f4b866251b3004/GakelfojeNairwogewerwhiheecem ?

Hi @lindexi I have checked your given sample it is working as expected thank you for your demo code