what can i do with that scrollviewer?

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WPF

grid

-i used a GroupBox with a scrollviewer inside it ..and inside scrollviewer i put a grid and begin to put my controls (3 textblocks and 6 textboxes)
-after making my scrollviewer to scroll my content i faced a trouble of grid inside scrollviewer appear behind things like the next pic

http://www.4shared.com/photo/uAbOhsBX/q_online.html

and this is my XAML code ..i don't know if i miss something to do

<GroupBox BorderBrush="#FF0000DD" FontSize="13" FontWeight="Bold" Header="General Information" HorizontalAlignment="Stretch" Margin="363,20,38,368" Name="groupBox1" VerticalAlignment="Stretch" Panel.ZIndex="0">
                            <ScrollViewer Height="Auto" Name="scrollViewer1" Width="Auto" ScrollChanged="scrollViewer1_ScrollChanged" VerticalScrollBarVisibility="Auto" >
                                <Grid Name="grid1" Height="Auto">
                                    <Grid.RowDefinitions>
                                        <RowDefinition />
                                        <RowDefinition />
                                        <RowDefinition />
                                        <RowDefinition />
                                        <RowDefinition />
                                        <RowDefinition />
                                    </Grid.RowDefinitions>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="2*" />
                                        <ColumnDefinition Width="*" />
                                    </Grid.ColumnDefinitions>
                                    <TextBlock Grid.Column="1" Grid.RowSpan="1" Height="Auto" HorizontalAlignment="Right" Margin="0" Name="textBlock1" Text="Generic ID" VerticalAlignment="Center" FontSize="14" Padding="0" />
                                    <TextBlock FontSize="14" Height="Auto" HorizontalAlignment="Right" Margin="0" Name="textBlock2" Text="Generic Name" VerticalAlignment="Center" Grid.Column="1" Grid.Row="1" Padding="0" />
                                    <TextBlock FontSize="14" Height="Auto" HorizontalAlignment="Right" Margin="0" Name="textBlock3" Text="Other Names" VerticalAlignment="Center" Grid.Column="1" Grid.Row="2" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox1" VerticalAlignment="Center" Width="197" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox2" VerticalAlignment="Center" Width="197" Grid.Row="1" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox3" VerticalAlignment="Center" Width="197" Grid.Row="2" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox4" VerticalAlignment="Center" Width="197" Grid.Row="3" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox5" VerticalAlignment="Center" Width="197" Grid.Row="4" Padding="0" />
                                    <TextBox Height="23" HorizontalAlignment="Center" Margin="0" Name="textBox6" VerticalAlignment="Center" Width="197" Grid.Row="5" Padding="0" />
                                </Grid>
                            </ScrollViewer>
                        </GroupBox>