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ComboBox Updates ListBox

I have visual studio 2010.

I have a ListBox and a ComboBox , if you select an item from the list and after clicking on the combo box refresh the list. It's like clearing a drop down list and adding items again.

If you open a new project, add a ListBox, add some items to the ListBox, add a ComboBox, start the project, select one item from the list, select ComboBox and ListBox, for some reason update.

Does anyone know why this is happening?

If someone can try this, see if there is a problem with VB or some settings in my program.

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: ,

ListBox ( #), :

Public Class MyListBox
  Inherits ListBox

  Private WM_KILLFOCUS As Integer = &H8

  Protected Overrides Sub WndProc(ByRef m As Message)
    If m.Msg <> WM_KILLFOCUS Then
      MyBase.WndProc(m)
    End If
  End Sub

End Class
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