combobox 下拉式輔助選字

由圖示效果,類似 SQL like 'aaa%' 效果;英文字完全沒問題,但是中文字要再多一空隔再倒回(backspace)即可看到下拉輔助選字效果.
底下為source:

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim aname As New AutoCompleteStringCollection
aname.Add("w")
aname.Add("wu")
aname.Add("wus")
aname.Add("wush")
aname.Add("wushi")
aname.Add("good")
aname.Add("program")
aname.Add("池")
aname.Add("池龍")
aname.Add("池龍工")
aname.Add("池龍工作")
aname.Add("池龍工作室")

ComboBox1.AutoCompleteMode = AutoCompleteMode.Suggest
ComboBox1.AutoCompleteSource = AutoCompleteSource.CustomSource
ComboBox1.AutoCompleteCustomSource = aname

End Sub
End Class