C# 为textbox控件实现controltemplate和datatriggers

我尝试为textbox实现controltemplate和datatriggers。。Xaml代码如下所示：

<TextBox x:Uid="txtagevals" x:Name="txtAge" Height="25" Width="80" Background="Wheat"  BorderThickness="1" BorderBrush="Black">
                                                        <TextBox.Template>
                                                            <ControlTemplate x:Uid ="txtagevals" TargetType="{x:Type TextBox}">
                                                                <Border Background="{TemplateBinding Background}" 
                                            BorderBrush="Black" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="5">
                                                                    <ScrollViewer x:Name="PART_ContentHost"/>
                                                                </Border>
                                                                <ControlTemplate.Triggers>
                                                                    <DataTrigger Binding="{Binding Age}" Value="18">
                                                                        <Setter **TargetName=""** Property="Text" Value="Green" />
                                                                    </DataTrigger>
                                                                </ControlTemplate.Triggers>
                                                            </ControlTemplate>
                                                        </TextBox.Template>
                                                    </TextBox>      

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你能帮我。。。在上面的代码中，我的目标名称=”应该是什么

有关更多示例，请参见