Windows Phone 7中listbox的使用方法，求解答~！
我在listbox里面插入了image，textblock怎么在点击某一项的时候获取textblock的text，求各位大虾帮帮忙啊~！急求~~~！[code=C#][/code]
<ListBox Height="706" ItemsSource="{Binding Source={StaticResource TableNumCollection},Path=DataCollection}" HorizontalAlignment="Left" Name="listBoxTableNum" VerticalAlignment="Top" Width="456" Foreground="White" Background="Black" SelectionChanged="listBoxTableNum_SelectionChanged">
<ListBox.ItemTemplate>
<DataTemplate x:Name="Item">
<StackPanel Orientation="Horizontal">
<Image Source="{Binding Path=ImageUrl}"/>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding TableNums}" Foreground="White"/>
</StackPanel>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>


[code=C#][/code]


public class TableNums : List<TableNum>
{
public TableNums()
{
BuildCollection();
}
private const string imageUrl = "../Img/";

public ObservableCollection<TableNum> DataCollection { get; set; }

public ObservableCollection<TableNum> BuildCollection()//绑定的数据
{
DataCollection = new ObservableCollection<TableNum>();
DataCollection.Add(new TableNum("１ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("２ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("３ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("４ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("５ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("６ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("７ 号 桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("８ 号 桌", imageUrl + "Smile.jpg));
DataCollection.Add(new TableNum("９ 号 桌", imageUrl + "Smile.jpg));
DataCollection.Add(new TableNum("１０号桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("１１号桌", imageUrl + "Smile.jpg"));
DataCollection.Add(new TableNum("１２号桌", imageUrl + "Smile.jpg"));
return DataCollection;
}
}



[code=C#][/code]


public class TableNum
{
public string TableNums { get; set; }
public string ImageUrl { get; set; }

public TableNum(string tablenums, string imageurl, string button)
{
this.TableNums = tablenums;
this.ImageUrl = imageurl;
}

}

我想要获取TableNums,该怎么在selectionchanged


[解决办法]
通过 sender 去获取