带Collection的自定义控件：出现Collection编辑器，但立即再次消失

Question

public partial class gttDataSet : DataSet
{
    private dsTables _dsTables = new dsTables();

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    [Editor("System.ComponentModel.Design.CollectionEditor, System.Design", typeof(UITypeEditor))]
    public dsTables gttTables
    {
        get { return _dsTables; }
        set { _dsTables = value; }
    }
}

public class dsTables : BaseCollection
{
    // See `EDIT 2:` at the bottom of the question
    public object[] Items()
    {
        object[] test = List.ToArray();
        return test;
    }

    // See `EDIT 1:` at the bottom of the question
    public dsTable Item(int index)
    {
        return (dsTable)List[index];
    }

    public dsTable Add()
    {
        dsTable Result = new dsTable();
        this.List.Add(Result);
        return Result;
    }

    public void Remove(dsTable table)
    {
        List.Remove(table);
    }

    public int IndexOf(dsTable table)
    {
        return List.IndexOf(table);
    }

    public bool Contains(dsTable table)
    {
        return List.Contains(table);
    }
}

public class dsTable
{
    [Editor("System.ComponentModel.Design.MultilineStringEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
    string SelectText { get; set; }

    [Editor("System.ComponentModel.Design.MultilineStringEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
    string SelectTextForUpdate { get; set; }

    [Editor("System.ComponentModel.Design.MultilineStringEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
    string DesignWhereText { get; set; }

    [Editor("System.ComponentModel.Design.MultilineStringEditor, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor))]
    string UserWhereText { get; set; }

    bool IsStoredProcedure { get; set; }

    bool RetrieveColumns { get;  }
}

编辑2:
添加了public object[]Items()，因为有几个网站告诉我需要集合编辑器来确定要处理的对象类型。
不幸的是，它没有解决我的问题

Edit3:
尝试将Items作为属性代替方法。但这也没有解决问题。

    public object[] Items
    {
        get
        {
            object[] test = List.ToArray();
            return test;
        }

        set 
        {
            _dsTables.Clear();
            foreach (object item in value)
            {
                _dsTables.Add((dsTable)item);
            }
        }
    }

Answer 1

最后发现了问题，原来我使用了错误的类型来继承

所以

public class dsTables : BaseCollection

一定是

public class dsTables : CollectionBase