想准确方便把TextBlock放置到底图下?请前辈指导

想准确方便把TextBlock放置到底图上?请前辈指导!
开发环境:vs2010+Silverlight。
背景:放置了一个底图,上面放置很多TextBlock。
问题:想准确方便把TextBlock放置到底图上,请前辈指导!(我现在是把图划分为多行多列,然后把TextBlock放到哪行哪列上去,这样感谢调整一个表要很多时间)。

下面是我的图片和代码:




 <Grid.RowDefinitions>
  <RowDefinition Height="80"/>
  <RowDefinition Height="30"/>
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />
  <RowDefinition Height="30"/>
  <RowDefinition Height="30"/>
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />
  <RowDefinition Height="30" />

  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
  <ColumnDefinition Width="100"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
  <ColumnDefinition Width="50"/>
   
  </Grid.ColumnDefinitions>

 <TextBlock Text="{Binding ProjectNam}" Grid.Row="1" Grid.Column="10" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding ConArea}" Grid.Row="3" Grid.Column="3" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding InvAmount}" Grid.Row="1" Grid.Column="13" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding LeadingInd}" Grid.Row="3" Grid.Column="10" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding Year}" Grid.Row="1" Grid.Column="15" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding Remarks}" Grid.Row="1" Grid.Column="16" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding CheAccAre}" Grid.Row="1" Grid.Column="17" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding CheAccGra}" Grid.Row="1" Grid.Column="18" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding CommFinan}" Grid.Row="1" Grid.Column="19" HorizontalAlignment="Center" VerticalAlignment="Center" />
  <TextBlock Text="{Binding CroSeFina}" Grid.Row="1" Grid.Column="20" HorizontalAlignment="Center" VerticalAlignment="Center" />