WPF – Remove focus when clicking outside of a textbox

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Rather than adding new control to window, I think you should give your Grid a name and react to the MouseDown event on your window, moving the focus to the Grid itself. Something like this: 

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Title="Window1" 
    Height="412" Width="569" 
    MouseDown="Window_MouseDown" 
    Name="window1">

    <Grid ShowGridLines="False" 
          Background="#01FFFFFF"
          KeyDown="Grid_KeyDown" 
          Name="grid1" 
          Focusable="True">

          <TextBox Width="120" Margin="117,61,0,0" 
                   Name="textBox1" 
                   VerticalAlignment="Top" 
                   HorizontalAlignment="Left"/>
    </Grid>
</Window>

code behind:

private void window1_MouseDown(object sender, MouseButtonEventArgs e)
{
    grid1.Focus();
}

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