refering datatemplate from datagrid in silverlight in code behind file

Question

in this how to refer texbox in datatemplate in cs file and how to refering this textbox as child element to data grid

AutoGenerateColumns="False" RowHeight="20"
ColumnHeaderStyle="{StaticResource FOTDataGridColumnHeaderStyle}"
AlternatingRowBackground="#FFEEEEEE" RowBackground="White" GridLinesVisibility="All"
CanUserResizeColumns="False" Margin="4,0,4,4"

                    >
                <data:DataGrid.Columns>
                    <data:DataGridTemplateColumn  Header="" Width="96">
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right">
                                    <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Text="{Binding row1}" Style="{StaticResource TextBlockLabelStandardStyle}" />
                                    <!--<CheckBox IsChecked="false" HorizontalAlignment="Center" VerticalAlignment="Center"></CheckBox>-->
                                </StackPanel>
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>
                    <data:DataGridTemplateColumn Width="67" Header="-4B/15" >
                        <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate" >
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding}" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff" Checked="RadioButton_Checked" />
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Name="text1" Text="{Binding row2}" HorizontalAlignment="Center" VerticalAlignment="Center" TextAlignment="Center" IsEnabled="{Binding boo}"  Style="{StaticResource Texted}"   Loaded="TextBox_Loaded"/>   <!--Style="{StaticResource TextBlockLabelStandardStyle}"-->
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                        <!--<data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding row2}" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="11" />
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>-->
                    </data:DataGridTemplateColumn>
                    <data:DataGridTemplateColumn Width="67" Header="-4B/05">
     <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate">
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding }" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff"/>
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding row3}" HorizontalAlignment="Center" VerticalAlignment="Center" IsEnabled="{Binding boo}" Style="{StaticResource Texted}" />
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>

                    <data:DataGridTemplateColumn Width="67"  Header="-4BI/15">
     <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate">
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding}" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff"/>
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <Grid Background="#FFDEECD3">

                                    <TextBox  Text="{Binding row4}" HorizontalAlignment="Center" VerticalAlignment="Center" IsEnabled="{Binding boo}"  Style="{StaticResource Texted}" />
                                </Grid>
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>
                    <data:DataGridTemplateColumn Width="66"  Header="-4BI/05">
      <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate">
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding}" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff"/>
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding row5}" HorizontalAlignment="Center" VerticalAlignment="Center" IsEnabled="{Binding boo}" Style="{StaticResource Texted}" />
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>
                    <data:DataGridTemplateColumn  Width="66"  Header="-4B/20">
     <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate">
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding}" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff"/>
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding row6}" HorizontalAlignment="Center" VerticalAlignment="Center"  IsEnabled="{Binding boo}" Style="{StaticResource Texted}" />
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>
                    <data:DataGridTemplateColumn  Width="66" Header="-4BI/20">
      <data:DataGridTemplateColumn.HeaderStyle>
                            <Style TargetType="localprimitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}">
                                <Setter Property="ContentTemplate">
                                    <Setter.Value>
                                        <DataTemplate>
                                            <Grid x:Name="grdCol1" Canvas.Top="0" Canvas.Left="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Grid.ColumnSpan="2" Grid.RowSpan="2">
                                                <Grid.RowDefinitions>
                                                    <RowDefinition Height=".1*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".4*" />
                                                    <RowDefinition Height=".1*" />
                                                </Grid.RowDefinitions>
                                                <TextBlock Grid.Row="1"   TextAlignment="Center" TextWrapping="Wrap" Text="{Binding}" Cursor="Hand" VerticalAlignment="Center" HorizontalAlignment="Center"/>
                                                <RadioButton Grid.Row="2" FontSize="11"  Cursor="Hand" HorizontalAlignment="Center" VerticalAlignment="Center" GroupName="grpTakeoff"/>
                                            </Grid>
                                            <!--<TextBlock Canvas.Top="0" Canvas.Left="0"  TextWrapping="Wrap" Text="{Binding}" MaxWidth="35"/>-->
                                        </DataTemplate>
                                    </Setter.Value>
                                </Setter>
                            </Style>
                        </data:DataGridTemplateColumn.HeaderStyle>
                        <data:DataGridTemplateColumn.CellTemplate>
                            <DataTemplate>
                                <TextBox Text="{Binding row7}" HorizontalAlignment="Center" VerticalAlignment="Center" IsEnabled="{Binding boo}" Style="{StaticResource Texted}" />
                            </DataTemplate>
                        </data:DataGridTemplateColumn.CellTemplate>
                    </data:DataGridTemplateColumn>

                </data:DataGrid.Columns>

            </data:DataGrid>