Silverlight中设计焦点和文本框回车到下一个控件

1.想在Silverlight首次启动让某个文本框获取焦点，使用Loaded事件中txt.Focus()是不起做用的，要完成这功能只要添加一句代码即可: 

        private void LayoutRoot_Loaded(object sender,RoutedEventArgs E)
        {
            HtmlPage.Plugin.Invoke("focus");
            txtName.Focus();

        }

2.在程序中为了方便用户，在一个文本框中按回车后跳到别一个文本框或其它控件，我们可以对原有的TextBox进行扩充，添加一个NextControl的属性用于保存下一个控件的名字,

另外为了方便我加了一个ToNextControl的事件，这样用起来更加方便，代码如下:

namespace HahaMan.SLTools.Controls
{
    public class myTextBox:TextBox
    {
        //事件
        public event EventHandler ToNextControl;

        private String nextControl="";
        //用于保存下一个控件的名字
        public String NextControl
        {
            get { return nextControl; }
            set { nextControl = value; }
        }

        protected override void OnKeyDown(KeyEventArgs E)
        {
            base.onKeyDown(E);
            if (e.Key == Key.Enter)//如果是回车
            {
                if (ToNextControl != null)//如果自己写了事件处理程序
                {
                    ToNextControl(this,E);//调用事件
                }
                else
                {
                    //如果没有指定事件
                    if (nextControl != null && nextControl.Length > 0)
                    {
                         //查找下一个控件
                        Control c = (this.Parent as Panel).FindName(nextControl) as Control;
                        if (c != null)
                        {
                            c.Focus();
                        }
                    }
                }
            }
        }
    }
}

使用方法一:

<my:myTextBox Height="23" HorizontalAlignment="Left" Margin="786,152,0" Name="txtName" NextControl="txtPwd" VerticalAlignment="Top" Width="120" />
            <my:myTextBox Height="23" HorizontalAlignment="Left" Margin="786,205,0" Name="txtPwd"  NextControl="btnLogin" VerticalAlignment="Top" Width="120" />
            <Button Content="登录" Height="23" Margin="763,259,0" Name="btnLogin" VerticalAlignment="Top" HorizontalAlignment="Left" Width="56" Click="btnLogin_Click" />

使用方法二:
xaml代码:

<my:myTextBox Height="23" HorizontalAlignment="Left" Margin="786,0" Name="txtName"  VerticalAlignment="Top" Width="120" ToNextControl="toNextControl" />
            <my:myTextBox Height="23" HorizontalAlignment="Left" Margin="786,0" Name="txtPwd"   VerticalAlignment="Top" Width="120" ToNextControl="toNextControl" />
            <Button Content="登录" Height="23" Margin="763,0" Name="btnLogin" VerticalAlignment="Top" HorizontalAlignment="Left" Width="56" Click="btnLogin_Click" />

cs代码:

        private void toNextControl(object sender,EventArgs E)
        {
            if (sender == txtName) txtPwd.Focus();
            if (sender == txtPwd) btnLogin.Focus();
        }