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    The following example demonstrates how to show a tooltip on a DataRow which displays the value corresponding to the content of a cell of a hidden column.

    XAML
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    <Grid xmlns:xcdg="http://schemas.xceed.com/wpf/xaml/datagrid">
  <Grid.Resources>
    <Style TargetType="{x:Type xcdg:DataRow}">
      <EventSetter  Event="MouseEnter"
                    Handler="OnDataRowMouseEnter" />
    </Style>
    <xcdg:DataGridCollectionViewSource x:Key="cvs_orders"
                                       Source="{Binding Source={x:Static Application.Current}, Path=Orders}"/>
  </Grid.Resources>
  <xcdg:DataGridControl x:Name="OrdersGrid"
                        ItemsSource="{Binding Source={StaticResource cvs_orders}}" >
    <xcdg:DataGridControl.Columns>
      <xcdg:Column FieldName="OrderID"
                   Visible="False" />
    </xcdg:DataGridControl.Columns>
  </xcdg:DataGridControl>
</Grid>

     

    VB.NET
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    Private Sub OnDataRowMouseEnter(ByVal sender As Object, ByVal e As MouseEventArgs)
   Dim dataRow = TryCast(sender, Xceed.Wpf.DataGrid.DataRow)
   If dataRow Is Nothing Then
      Return
   End If
   Dim dataRowView = TryCast(dataRow.DataContext, System.Data.DataRowView)
   If dataRowView Is Nothing Then
      Return
   End If
   dataRow.ToolTip = dataRowView.Row("OrderID").ToString()
End Sub

     

    C#
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    private void OnDataRowMouseEnter( object sender, MouseEventArgs e )
{
  var dataRow = sender as Xceed.Wpf.DataGrid.DataRow;
  if( dataRow == null )
    return;
  var dataRowView = dataRow.DataContext as System.Data.DataRowView;
  if( dataRowView == null )
    return;
  dataRow.ToolTip = dataRowView.Row[ "OrderID" ].ToString();
}