Finding the co-ordinates of a button

 hi everybody,
I am newbie to silverlight. I am developing a particular application where I have to generate buttons dynamically and then connect these buttons using lines.


I have a simple query.
This is how my xaml looks 
<UserControl x:Class="SilverlightApplication3.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Width="400" Height="300">
    <Grid x:Name="LayoutRoot" Background="White">
        <Button Background="Aquamarine" Height="21" Margin="110,19,140,0" VerticalAlignment="Top" Content="Button1" Click="Button_Click" x:Name="btn1" Grid.Row="0" ></Button ...