WPF -- Dynamically generated DataGrid

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C#

If I generate the columns of a DataGrid at runtime (because the number of columns is not known before) this way:

var i = 0;
foreach (var property in Records[0].Properties)
 {
 var binding = new Binding("Properties[" + i.ToString() + "].Value");
 dg.Columns.Add(new DataGridTextColumn() { Header = <...>, Binding = binding });
 }
 DataContext = this;

where

<DataGrid Name ="dg" AutoGenerateColumns="False" ItemsSource="{Binding Path=Records}" />

this WORKS fine.


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On the other hand, if the number of DataGrids is unknown at compile time, and I try to generate them on the fly:

var dg2 = new DataGrid();
  var binding = new Binding("Properties[0].Value");
  var column = new DataGridTextColumn() { Header = "X", Binding = binding };
  dg2.Columns.Add(column);
  DataContext = this;
  var main = ((MainWindow)App.Current.Windows[0]); // I'm in a different class now
  main.Base.Children.Add(dg2);     // Base is the main Grid.

then it doesn't work (It just shows the header, no data). Any ideas? Thanks!!