grid with checkbox column in silverlight

 /////////////xaml code./////////////////////////////////
<data:DataGrid x:Name="dgPerson" Margin="8" IsReadOnly="True" 
                   LoadingRow="dgPerson_LoadingRow"  AutoGenerateColumns="False" Width="425" >
                            <data:DataGrid.Columns>
                                <data:DataGridTemplateColumn Width="80" >
                                    <data:DataGridTemplateColumn.CellTemplate>
                                        <DataTemplate>
                                            <CheckBox x:Name="chkPerson" Click="chkPerson_Click"
                                      VerticalAlignment="Center" IsChecked="false" HorizontalAlignment="Center" HorizontalContentAlignment="Center"/>
                                        </DataTemplate>
                                    </data:DataGridTemplateColumn.CellTemplate>
                                </data:DataGridTemplateColumn>
                                <data:DataGridTextColumn Header="Fee Type" Binding="{Binding Residualfee}" MinWidth="120" Width="SizeToCells" CanUserReorder="True" CanUserSort="True"/>
                                <data:DataGridTemplateColumn Width="80" Header="Fee" >
                                    <data:DataGridTemplateColumn.CellTemplate>
                                        <DataTemplate>
                                            <TextBox Width="120" Height="30" Name="feeamount"  Text="{Binding FeeAmount,Mode=TwoWay}"
                                                     ></TextBox>
                                        </DataTemplate>
                                    </data:DataGridTemplateColumn.CellTemplate>
                                </data:DataGridTemplateColumn>
                            </data:DataGrid.Columns>
                        </data:DataGrid>
                        <data:DataPager x:Name="dataPager1" Width="425" Margin="0,-10,0,0"
                                    Source="{Binding Path=ItemsSource,ElementName=dgPerson}"
                        PageSize="2"    DisplayMode="FirstLastPreviousNext" ></data:DataPager>

//////////////////////////public var////////////////////
 //List for Original List of Facilitie
        ObservableCollection<AssignFecilitieToProvision> myList;

        //List for selected Facilitie
        ObservableCollection<AssignFecilitieToProvision> personList = new ObservableCollection<AssignFecilitieToProvision>();
////////////////////////////////chk _clik////////////////////
 CheckBox chk = sender as CheckBox;

            bool check = chk.IsChecked.Value;
            var obj = dgPerson.SelectedItem as AssignFecilitieToProvision;
           
            Facilitie p = chk.DataContext as Facilitie;
            if (check)
            {
                if (!personList.Contains(obj))
                    personList.Add(obj);

            }
            else
            {
                personList.Remove(obj);
            }
////////////////save button////////////
foreach (var item in personList)
            {
///////////do insert
}