请教一个WPF问题
问题描述：
在一个UserControl里面放了一个TextBox，TextBox的初始visibility属性设为Hidden，
在UserControl的ControlTemplate.triggers中定义当UserControl获得焦点(IsFocused)时
TextBox的visibility变为visible，测试结果发现当TextBox显示后，点击textbox，光标进不去
整个控件会闪烁一下
但是如果一开始就设为visible，没有问题
代码:
UserControl1.xaml
<UserControl x:Class="WpfApplication1.UserControl1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" Focusable="True" MouseLeftButtonDown="UserControl_MouseLeftButtonDown"> <UserControl.Template> <ControlTemplate> <Grid Width="100" Height="100" Background="AliceBlue"> <TextBox Name="text" Visibility="Hidden" HorizontalAlignment="Center" VerticalAlignment="Center">123</TextBox> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsFocused" Value="True"> <Setter TargetName="text" Property="Visibility" Value="Visible" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </UserControl.Template> </UserControl>
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Navigation;using System.Windows.Shapes;namespace WpfApplication1{ /// <summary> /// UserControl1.xaml 的交互逻辑 /// </summary> public partial class UserControl1 : UserControl { public UserControl1() { InitializeComponent(); } private void UserControl_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { Focus(); } }}