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POwpf popup doesn't close automatically when datagrid inside popup captures the mouse
 

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    <p>I have a popup with <code>StaysOpen=False</code> so I want to close it by clicking anywhere outside of popup. Inside a popup I have a <code>DataGrid</code>. If I open popup and then click somewhere else the popup will be closed. But it won't happen if before clicking outside of popup I will click on column header in <code>DataGrid</code>. Test XAML: </p> <pre><code>&lt;Window x:Class="Test.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525" VerticalAlignment="Center" HorizontalAlignment="Center" Foreground="Black"&gt; &lt;Grid&gt; &lt;ToggleButton x:Name="btn" VerticalAlignment="Top"&gt;Open&lt;/ToggleButton&gt; &lt;Popup StaysOpen="False" IsOpen="{Binding IsChecked, ElementName=btn}" &gt; &lt;DataGrid Width="150" Height="150"&gt; &lt;DataGrid.Columns&gt; &lt;DataGridTextColumn Header="Column" /&gt; &lt;/DataGrid.Columns&gt; &lt;/DataGrid&gt; &lt;/Popup&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>I think that it happens because column header captures the mouse on click and popup doesn't receive mouse events anymore. I've tried to add a handler on <code>LostMouseCapture</code> event in order to capture mouse back by popup but it doesn't seem to work that easy. Any ideas?</p>
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