Tree Type Convert

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C#3.0

C#

Hi:
When I rewrite a tree control, I defined a set of class, when you first open the designer can add to the collection of data, but appeared to re-open out an exception. Type "MyTree.ObjectListInfo []" of the object can not be converted to type "MyTree.ObjectListInfo []". Can you help me?
Thanks
Code:
public partial class MyTree: TreeList
(
private bool fIsLoaded = false;
private string fTypeName = string.Empty;
private List <ObjectListInfo> fTypeList = new List <ObjectListInfo> ();

public bool TreeIsLoaded (get (return fIsLoaded;))

public string TypeName (get (return fTypeName;) set (fTypeName = value;))

public List <ObjectListInfo> TypeList (get (return fTypeList;) set (fTypeList = value;))

public MyTree ()
(
InitializeComponent ();
)
)