get stackpanel inside control values in datagrid in silverlight

Stackpanel Inside Controls in datagrid:

if we have button inside datagrid the click the button and add the below lines
 StackPanel stackpanel = ((Button)sender).Parent as StackPanel;
    TextBox txtName = stackpanel.Children[0] as TextBox;
    TextBox txtLName = stackpanel.Children[1] as TextBox;

URL:http://forums.silverlight.net/t/173626.aspx/1