[Silverlight]取得DataTemplate中的控制項

<!-- DataTemplate 資源 -->
<DataTemplate x:Key="DataTemplatePopList">
	<Grid d:DesignWidth="99" d:DesignHeight="148" Height="130" Width="130">
		<Button x:Name="VoteButton" Content="投票" />
                <TextBlock x:Name="VoteTextBlock" Text="{Binding ObjectBills}" />
		<Image x:Name="VoteImage" Source="{Binding ImageSource}" />
	</Grid>
</DataTemplate>
<!-- 使用DataTemplate資源 -->
<ListBox x:Name="VoteListBox" ItemTemplate="{StaticResource DataTemplatePopList}" />

//取得DataTemplate中的控制項
ListBoxItem voteListBoxItem = (ListBoxItem)(VoteListBox.ItemContainerGenerator.ContainerFromItem(VoteListBox.SelectedItem));
TextBlock voteTextBlock = FindVisualChild<TextBlock>(voteListBoxItem, "VoteTextBlock");

//尋找視覺化樹下的子項目
private childItem FindVisualChild<childItem>(DependencyObject obj, String childName) where childItem : DependencyObject
{
    for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
    {
        DependencyObject child = VisualTreeHelper.GetChild(obj, i);
        if (child != null &&
            child is childItem &&
            child.GetValue(NameProperty).ToString() == childName)
            return (childItem)child;
        else
        {
            childItem childOfChild = FindVisualChild<childItem>(child, childName);
            if (childOfChild != null)
                return childOfChild;
        }
    }
    return null;
}