How to add column in datagrid

How i can add column in wpf toolkit 开发者_如何学JAVAdatagrid from code behind? this does not works:

DataGridTemplateColumn txtc = new DataGridTemplateColumn();
        txtc.Header = "2";
        myGrid.Columns.Add(txtc);

this is my grid :

 <Controls:DataGrid.CellStyle>
            <Style TargetType="{x:Type Controls:DataGridCell}">
                <Setter Property="Background">
                    <Setter.Value>
                        <MultiBinding Converter="{StaticResource myHighlighterConverter}">
                            <MultiBinding.Bindings>
                                <Binding RelativeSource="{RelativeSource Self}"></Binding>
                                <Binding Path="Row"></Binding>
                            </MultiBinding.Bindings>
                        </MultiBinding>
                    </Setter.Value>
                </Setter>
            </Style>
        </Controls:DataGrid.CellStyle>
    </Controls:DataGrid>

WPF 4 has its own DataGrid, the column you created is from that namespace, it is not compatible with the Toolkit-DataGrid. If you use WPF 4 you probably should not use the Toolkit DataGrid at all.