Wpf Gridbind Column Not Display

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WPF

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This is my .xaml code fore display grid
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<Grid Grid.Row="5" Name="gridHistoricPerformance" Height="Auto" Width="Auto" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="5,25,5,10">
                      <Grid.RowDefinitions>
                          <RowDefinition Height="Auto"/>
                          <RowDefinition Height="Auto"/>
                      </Grid.RowDefinitions>
                      <my:DataGrid Grid.Row="5" Height="Auto" Width="Auto" HorizontalAlignment="Left" VerticalAlignment="Top" Name="dgHistoricPerformance" Margin="0,1,0,5"  Background="{x:Null}" BorderBrush="Black" BorderThickness="0,2,0,0" IsReadOnly="True" FontSize="20" GridLinesVisibility="All" HeadersVisibility="Column" ColumnHeaderHeight="50" >
                          <my:DataGrid.ColumnHeaderStyle>
                              <Style TargetType="my1:DataGridColumnHeader">
                                  <Setter Property="Background" Value="Transparent"/>
                                  <Setter Property="Height" Value="0"/>
                                  <Setter Property="BorderThickness" Value="0,0,0,2"/>
                                  <Setter Property="BorderBrush" Value="Black"/>
                              </Style>
                          </my:DataGrid.ColumnHeaderStyle>
                      </my:DataGrid>
                  </Grid>

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backend code for display colume in grid
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ds = new DataSet();
DataTable dt = new DataTable();
ds.Tables.Add(dt);

DataColumn cl = new DataColumn("Col1", typeof(string));
cl.MaxLength = 100;
dt.Columns.Add(cl);

cl = new DataColumn("Col2", typeof(string));
cl.MaxLength = 100;
dt.Columns.Add(cl);

DataRow rw = dt.NewRow();
dt.Rows.Add(rw);
rw["Col1"] = "Value1";
rw["Col2"] = "Value2";


dgHistoricPerformance.ItemsSource = ds.Tables[0].DefaultView;

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when i run this code this is display row but note display column header and property which is i am missing if any idea about this please tell me

-its nit display column header....