无法设置图钉属性（WP8）

Question

I have a map with Pushpin :

<maps:Map ZoomLevel="18" Height="575" x:Name="map1" Width="415" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="0,0,-10,0">
    <toolkit1:MapExtensions.Children>
        <toolkit1:Pushpin x:Name="push1" GeoCoordinate="" Content=""  Background="Gray" ContentTemplate="{StaticResource Template_Content}">
        </toolkit1:Pushpin>
    </toolkit1:MapExtensions.Children>
</maps:Map>

I try to set properties from the code:

map1.Center = currentObject.Coords;
push1.GeoCoordinate = currentObject.Coords;
push1.Content = currentObject.Name;

So Map works, but Pushpin returns NullReference Exception . What the reason and how to fix?

Answer 1

map1.Center = currentObject.Coords;
Pushpin pushpin = (Pushpin)this.FindName("push1");
pushpin .GeoCoordinate = currentObject.Coords;
pushpin .Content = currentObject.Name;