来自另一个组合框的源子属性的SelectedValue

Question

一个新手问题，但我似乎无法绕过这个问题。

我的结构如下

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class Connection
{
   private static ObservableCollection<Connection> conlist = getConnections();
   private string _channel;
   //other fields 

   public string Channel
   {
      get
         { return this._channel; }
   }

   public static ObservableCollection<Connection> Ports
   {
      get
         { return conlist; }
   }

   private ObservableCollection<Connection> getConnections(string path)
   {
      //Gets list of connections from a file
   }

现在，我要有两个组合框，一个选择显示说明的选项卡，我希望另一个显示在Connection.Ports中的所有端口，但最初具有选定值作为Tab.Connection < / p>

class Tab
{
   private Connection _channel;
   private string _title;

   public string Title
   {
      get
      { return this._title; }
   }

   public string Connection
   {
      get { return this._channel; }
   }
}

提前谢谢