Silverlight4:如何在自定义列表中设置控件的属性

                <Pages:MyItemsControl ItemsSource="{Binding SquadFieldPlayers}">
                    <Pages:MyItemsControl.ItemsPanel>
                        <ItemsPanelTemplate>
                            <Canvas Height="180" Width="169" />
                        </ItemsPanelTemplate>
                    </Pages:MyItemsControl.ItemsPanel>
                    <Pages:MyItemsControl.ItemTemplate>
                        <DataTemplate>
                            <Pages:FieldItem />
                        </DataTemplate>
                    </Pages:MyItemsControl.ItemTemplate>
                </Pages:MyItemsControl >

“MyItemsContol”的源代码:

    public class MyItemsControl : ItemsControl
{
    protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
    {
        FrameworkElement contentitem = element as FrameworkElement;
        if (contentitem != null)
        {
            Binding leftBinding = new Binding("PositionX");
            Binding topBinding = new Binding("PositionY");
            contentitem.SetBinding(Canvas.LeftProperty, leftBinding);
            contentitem.SetBinding(Canvas.TopProperty, topBinding);
            base.PrepareContainerForItemOverride(element, item);             
        }
    }
}

问题1:如何设置FieldItem控件的另一个属性(我在里面有textBlock,希望他显示数据对象中的其他数据项)?

这是我的FieldItem控件:

<UserControl x:Class="VfmElitaSilverlightClientView.Pages.FieldItem" ...>    
<Grid Height="16" Width="16">
    <Ellipse Fill="Yellow" Height="16" Width="16">
    </Ellipse>
    <TextBlock Name="TeamNumberTextBlock" Text="22" TextAlignment="Center" FontStyle="Italic" />
</Grid>

问题2:为什么FieldItem的DataContext对象没有设置为my data对象?

谢谢您!