WPF DependencyProperty 自定义依赖项属性的问题

[bird_3333]

我参考http://msdn.microsoft.com/zh-cn/partners/system.windows.dependencyproperty(VS.95).aspx
定义名为LabelText的用户控件 自定义属性名为LabelName

    public partial class LabelText : UserControl
    {
        public static readonly DependencyProperty LabelTextProperty =
            DependencyProperty.Register(
            "LabelName", typeof(String),
            typeof(LabelText), null
            );
        public String LabelName
        {
            get { return (String)GetValue(LabelTextProperty); }
            set { SetValue(LabelTextProperty, value); }
        }
        public LabelText()
        {
            InitializeComponent();
//this.LabelName始终为NULL

        }
    }

我是使用如下方式引用该控件并初始值的
<....
xmlns:common="clr-namespace:CommonControl"
>
<common:LabelText LabelName="道具名称"></common:LabelText>

但在我的LabelText类的构造中无法得到LabelName为“道具名称” 它始终为NULL.
为何？？？？？？？？？？？？？？

[bird_3333]

改为这样，可以通过
<common:LabelText LabelName="道具名称"></common:LabelText>
赋值了，可如何实现在属性窗口编辑自定义属性的时候 自定义控件可以及时表现出来改变呢？
public partial class LabelText : UserControl
{
#region LabelValue
public static readonly DependencyProperty LabelValueProperty =
DependencyProperty.Register(
"LabelValue", typeof(String),
typeof(LabelText),
new PropertyMetadata(null, new PropertyChangedCallback(LabelValueChange))
);
#endregion
#region TextBoxValue
public static readonly DependencyProperty TextBoxValueProperty =
DependencyProperty.Register(
"TextBoxValue", typeof(String),
typeof(LabelText),
new PropertyMetadata(null, new PropertyChangedCallback(TextBoxValueChange))
);
#endregion
public String LabelValue
{
get { return (String)GetValue(LabelValueProperty); }
set { SetValue(LabelValueProperty, value); }
}
public String TextBoxValue
{
get { return (String)GetValue(TextBoxValueProperty); }
set { SetValue(TextBoxValueProperty, value); }
}
private Label mLabel = new Label();
private TextBox mTextBox = new TextBox();
public LabelText()
{
InitializeComponent();
Stage.Children.Add(mLabel);
Stage.Children.Add(mTextBox);
}

public static void LabelValueChange(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
LabelText labelText = o as LabelText;
labelText.mLabel.Content = labelText.LabelValue;
}
public static void TextBoxValueChange(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
LabelText labelText = o as LabelText;
labelText.mTextBox.Text = labelText.TextBoxValue;
}
}

[hbdxwudi]

http://www.langsin.com/index.html?ID=30可以看看视频教程

[sharpe]

我也遇到这个问题，，是怎么回事？