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我有以下数据模板：

    <DataTemplate x:Key="ToDoListBoxItemTemplate">
        <Grid x:Name="item2Expanded" HorizontalAlignment="Left" VerticalAlignment="Top" Width="480"  Background="{Binding Converter={StaticResource RowColour}}" MinHeight="81">
            <StackPanel HorizontalAlignment="Left" VerticalAlignment="Top" Width="420" Margin="60,0,0,0">
                <TextBox x:Name="taskTitle" HorizontalAlignment="Left" TextWrapping="Wrap" Text="{Binding ItemName}" VerticalAlignment="Top" Width="420" Background="{x:Null}" BorderBrush="{x:Null}" CaretBrush="#FF0080FF" SelectionBackground="#FFCFCFCF" Foreground="#FF4E4E4E" BorderThickness="3,3,3,6" FontSize="29.333" Style="{StaticResource listTextBoxTemplate}" InputScope="Text" SelectionForeground="#FF4E4E4E" KeyUp="taskTitle_KeyUp" LostFocus="taskTitle_LostFocus" Tap="taskTitle_Tap" IsReadOnly="True" Margin="0,1,0,0" DoubleTap="taskTitle_DoubleTap"/>
                <TextBox x:Name="taskDetail" HorizontalAlignment="Left" TextWrapping="Wrap" Text="Tea is an essential English beverage, it has a nice calming effect, and is often served alongside biscuits." VerticalAlignment="Top" Width="420" Background="{x:Null}" BorderBrush="{x:Null}" CaretBrush="#FF0080FF" SelectionBackground="#FFCFCFCF" Foreground="#FF878787" BorderThickness="3,0,3,6" FontSize="21.333" Style="{StaticResource listTextBoxTemplate}" InputScope="Text" SelectionForeground="#FF878787" Margin="0,-20,0,0" KeyUp="taskDetail_KeyUp" LostFocus="taskDetail_LostFocus" Padding="2,5,2,2" IsHitTestVisible="False"/>
                <Grid Height="170" Margin="0,-20,0,0">
                    <Button x:Name="chooseDateButton" Content="27/06/2013" HorizontalAlignment="Left" Margin="6,13,0,0" VerticalAlignment="Top" BorderBrush="#FF959595" Foreground="#FF959595" Width="157" HorizontalContentAlignment="Left" FontSize="20" Style="{StaticResource selectorButtonTemplate}"/>
                    <Button x:Name="chooseTimeButton" Content="12:00" HorizontalAlignment="Left" Margin="146,13,0,0" VerticalAlignment="Top" BorderBrush="#FF959595" Foreground="#FF959595" Width="99" HorizontalContentAlignment="Left" FontSize="20" Style="{StaticResource selectorButtonTemplate}"/>
                    <Button x:Name="setOrClearButton" Content="REMIND ME" HorizontalAlignment="Left" Margin="228,13,0,0" VerticalAlignment="Top" BorderBrush="#FF959595" Foreground="White" Width="180" FontSize="20" Background="#FF959595" Style="{StaticResource greyButtonTemplate}"/>
                    <Button x:Name="deleteButton" Content="DELETE TASK" HorizontalAlignment="Left" Margin="6,85,0,0" VerticalAlignment="Top" BorderBrush="#FFEE4747" Foreground="White" Width="180" FontSize="20" Background="#FFEE4747" Style="{StaticResource redButtonTemplate}"/>
                    <Image x:Name="retractButton" Margin="347,107,21,11" Source="/Assets/retract.png" Stretch="Fill" Tap="retractButton_Tap"/>
                </Grid>
            </StackPanel>
            <CheckBox x:Name="checkBox" IsChecked="{Binding IsComplete, Mode=TwoWay}" Content="" HorizontalAlignment="Left" Background="{x:Null}" BorderBrush="{x:Null}" Foreground="{x:Null}" Width="72" BorderThickness="0" Template="{StaticResource checkBoxTemplate}" Checked="checkBox_Checked" Unchecked="checkBox_Unchecked"/>
        </Grid>
    </DataTemplate>

其中 Grid item2Expanded 动态放置在 ListBox (Name="allToDoItemsListBox") 中。文本通过绑定添加到每个项目。

图片retractButton有Tap="retractButton_Tap"，如代码所示：

    private void retractButton_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        if (isItemExpanded == true)
        {
            // Compacts current item
            itemGrid.Height = taskTitle.ActualHeight; // Restores itemGrid height to fit only taskTitle
            taskTitle.IsReadOnly = true; // taskTitle becomes only double-tap editable, single tap to expand once more

            taskDetail.IsHitTestVisible = false; // Stops overlapping taps
            isItemExpanded = false;
        }

        // Adds the event handler for single tap event
        tapTimer.Tick += new EventHandler(tapTimer_Tick);
        tapTimer.Start();
    }

    private void tapTimer_Tick(object sender, EventArgs e)
    {
        // Stop timer
        tapTimer.Tick -= new EventHandler(tapTimer_Tick);
        tapTimer.Stop();

        // Rest of the single tap function
        if (isItemExpanded == false)
        {
            taskDetail.IsHitTestVisible = true;
            taskDetail.IsEnabled = false;

            // Expands current item
            itemGrid.Height = double.NaN; // Sets itemGrid height to auto
            isItemExpanded = true;

            // Yeah... don't ask.
            // Stops temporary text highlighting/auto jumping to keyboard
            taskTitle.IsEnabled = false;
            taskTitle.IsEnabled = true;

            taskDetail.IsEnabled = true;
        }
    }

但我无法访问此特定项目的 itemGrid、taskTitle 或 taskDetail。而且我不知道如何将它们传递给 tapTimer_Tick 函数。

我已经能够在元素上使用 Tag="{binding itemID}" ，但这仍然不允许我解决这个问题。如何找到 Tap 源自的网格 item2Expanded，然后按名称访问同一网格中的元素？

如果我想访问与单击相同的元素，那么很容易：

    private void taskTitle_Tap(object sender, System.Windows.Input.GestureEventArgs e)
    {
        TextBox taskTitle = (TextBox)sender;

        taskTitle.IsEnabled = false;
    }

我一直在尝试弄清楚如何使用 Visual Tree Helper 来解决这个问题，但我不知道该怎么做。

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