SilverLight Generate and Bind columns at runtime

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Silverlight

I need to add columns to silverlight columns at runtime and also perform the bindings for the columns.

This is how i do it statically in xaml

<sdk:DataGridTextColumn  CanUserReorder="True" CanUserResize="True" CanUserSort="True"  Header="CriteriaName" Width="2*" Binding="{Binding Path=[CriteriaName]}" IsReadOnly="True"  />

Now i want do the same in code behind,

here is what i have done

foreach(string Col in lColumnNames)
           {
               DataGridTextColumn DGCol=new DataGridTextColumn();
               DGCol.Header= Col;


               Binding lObjBinding = new Binding(Col);
               lObjBinding.Mode = BindingMode.OneWay;

               DGCol.Binding = lObjBinding;
               GrdQuickFindResult.Columns.Add(DGCol);


           }

This is not working.All i can see are blank rows in the DataGrid,as if the binding hasn't happened. Pls check and tell me if all the things that i have done using xaml is done using C# as well or is there some property that is left to be set in the Binding Object that i have created.
Thanx