Unable to see controls in MainPage.g.cs

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XAML

I have a simple question about XAML.

I created a grid element inside another grid and added a textblock and a web browser in it. However, I am unable to access it in MainPage.xaml.cs using their name (e.g. this.LastName) doesn't work. On further debugging, I saw that they are not declared in MainPage.g.cs. Since MainPage.g.cs is auto defined, I don't know how to fix it. Can someone help please? Below is my C# and XAML code. Thanks!
========================================================
public partial class MainPage : Microsoft.Phone.Controls.PhoneApplicationPage {
internal System.Windows.Controls.Grid LayoutRoot;
internal System.Windows.Controls.Grid ContentPanel;
internal Microsoft.Phone.Controls.LongListSelector MainLongListSelector;
internal System.Windows.Controls.Image RefreshIcon;
private bool _contentLoaded;

public void InitializeComponent() {
if (_contentLoaded) {
return;
}
_contentLoaded = true;
System.Windows.Application.LoadComponent(this, new System.Uri("/Suod;component/MainPage.xaml", System.UriKind.Relative));
this.LayoutRoot = ((System.Windows.Controls.Grid)(this.FindName("LayoutRoot")));
this.ContentPanel = ((System.Windows.Controls.Grid)(this.FindName("ContentPanel")));
this.MainLongListSelector = ((Microsoft.Phone.Controls.LongListSelector)(this.FindName("MainLongListSelector")));
this.RefreshIcon = ((System.Windows.Controls.Image)(this.FindName("RefreshIcon")));
}
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<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
    <phone:LongListSelector x:Name="MainLongListSelector" Margin="-12,-97,0,97" ItemsSource="{Binding Items}">
        <phone:LongListSelector.ItemTemplate>
            <DataTemplate>
                <StackPanel Margin="12,100,0,45">
                    <Grid x:Name="CompanyContentGrid">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="*"/>
                            <RowDefinition Height="*"/>
                        </Grid.RowDefinitions>
                        <TextBlock Grid.Row="0" Name="LastName" Text="{Binding Name}" TextWrapping="Wrap" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
                        <phone:WebBrowser Grid.Row="5" Height="400" Name="WebBrowser" Margin="12,-6,24,0" FontFamily="Portable User Interface"/>
                    </Grid>
                </StackPanel>
            </DataTemplate>
        </phone:LongListSelector.ItemTemplate>
    </phone:LongListSelector>
</Grid>
<Grid Grid.Row="2" >
    <Image Source="/Assets/Refresh.png" Name="RefreshIcon"  Width="80" Height="80" Tap="Image_Tap"/>
</Grid>