title: WPF show popup on DataGrid cell MouseOver
body: <p>I would like the following functionality: I have a datagrid, and when I go with my mouse pointer over a cell, I would my program to show a popup screen with information. When my mouse leaves the cell, obviously I want the popup to disappear. I hope I can do this only in XAML code.</p>
  
  <p>This is my popup in XAML:</p>
  
  <pre><code>&lt;Popup x:Name="_popup_agreementDetails" Placement="Center" AllowsTransparency="True"
                 HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Column="2" Margin="46,333,102,172" Grid.Row="2" IsOpen="{Binding IsChecked, ElementName=button}"&gt;
      &lt;my:UC1001_AgreementDetails_View Background="#FFF" Opacity="0.88" /&gt;
  &lt;/Popup&gt;
  </code></pre>
  
  <p>As you can see, the popup shows a user control I made. This is my datagrid:</p>
  
  <pre><code> &lt;DataGrid x:Name="employeeGrid" Height="250" Margin="25,0,10,0" ColumnHeaderStyle="{DynamicResource CustomColumnHeader}"&gt;
       &lt;DataGrid.Columns&gt;
           &lt;DataGridTextColumn Header="Naam" Width="150"/&gt;
           &lt;DataGridTextColumn Header="Januari" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Februari" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Maart" Width="*"/&gt;
           &lt;DataGridTextColumn Header="April" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Mei" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Juni" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Juli" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Augustus" Width="*"/&gt;
           &lt;DataGridTextColumn Header="September" Width="*"/&gt;
           &lt;DataGridTextColumn Header="Oktober" Width="*"/&gt;
           &lt;DataGridTextColumn Header="November" Width="*"/&gt;
           &lt;DataGridTextColumn Header="December" Width="*"/&gt;
       &lt;/DataGrid.Columns&gt;
   &lt;/DataGrid&gt;
  </code></pre>
  
  <p>I read some stuff about triggers and stuff to show the popup, but I don't know how to implement it on a datagrid cell. The popup should show on every cell. The information shown on the popup depends on the hovered cell.</p>
  
  <p>Does anyone know how to do this in XAML?</p>