我怎样才能“点击”WPF中的控件?

我有一个订单input表单,其中包含列表项和列表项。 我有我的项目模板,其中一个值是我的每个项目中的ComboBox

现在,除了购买订单之外,我的表单还可以创build贷项凭证,但是当我创build贷项凭证时,我希望将“贷项凭证”字样放在列表框中,但是, TextBlock在我的两个订单项 我想通过我的单击事件通过TextBlockComboBox ES,但我不知道如何做到这一点。

这就是我所拥有的(也许我是完全错误的,我有点儿是WPF的noob)

 <ListBox SelectionMode="Single" Grid.Row="2" ItemsSource="{Binding Path=LineItems}" HorizontalContentAlignment="Stretch" IsSynchronizedWithCurrentItem="True" Background="#66FFFFFF"> <ListBox.ItemContainerStyle> <Style TargetType="{x:Type ListBoxItem}"> <Setter Property="Background" Value="WhiteSmoke"/> <Setter Property="BorderThickness" Value="1" /> <Style.Triggers> <DataTrigger Binding="{Binding Path=IsPartBackOrder}" Value="True"> <Setter Property="Background" Value="Orange" /> </DataTrigger> </Style.Triggers> </Style> </ListBox.ItemContainerStyle> <ListBox.ItemTemplate> <DataTemplate DataType="{x:Type Entities:SalesOrderLineItem}" > <OrderEntry:SalesOrderLineItemCreate DataContext="{Binding}" DeleteSalesOrderLineItem="DeleteSalesOrderLineItem" Margin="0,3,3,0" > <OrderEntry:SalesOrderLineItemCreate.Resources> <Style TargetType="{x:Type OrderEntry:SalesOrderLineItemCreate}"> <Style.Triggers> <DataTrigger Binding="{Binding RelativeSource= { RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem} }, Path=IsSelected }" Value="True"> <Setter Property="Background" Value="LightBlue" /> <Setter Property="Foreground" Value="Black" /> </DataTrigger> </Style.Triggers> </Style> </OrderEntry:SalesOrderLineItemCreate.Resources> </OrderEntry:SalesOrderLineItemCreate> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <TextBlock Grid.Row="2" Text="Credit Memo" HorizontalAlignment="Center" VerticalAlignment="Center" FontSize="48" Height="Auto" FontStyle="Italic" Foreground="Red" Opacity=".25"> <TextBlock.Style> <Style TargetType="{x:Type TextBlock}"> <Style.Triggers> <DataTrigger Binding="{Binding Path=OrderType}" Value="CR"> <Setter Property="Visibility" Value="Visible" /> </DataTrigger> <DataTrigger Binding="{Binding Path=OrderType}" Value="CU"> <Setter Property="Visibility" Value="Hidden" /> </DataTrigger> </Style.Triggers> </Style> </TextBlock.Style> </TextBlock> 
 <TextBlock IsHitTestVisible="False" .../>