Custom DataGridView column property problem

[Kevin S Gallagher]

I am working on a custom column from Code Project were I want to persist a
value using the following code in the property HighlightBackgr oundColor.
Note the default color is "Red" but when changing the value in the IDE
property editor to say blue and hit OK next time in the editor it's still
"Red." So I am looking to see if I am totally off base or missing something
small. Thanks for any insight.

Public Class DropDownListCol umn
Inherits DataGridViewCom boBoxColumn

Public Sub New()
'Set the type used in the DataGridView
Me.CellTemplate = New DropDownListCel l
End Sub

Private mHighlightBackG roundColor As Color
<System.Compone ntModel.Categor y("Behavior") , _
System.Componen tModel.Descript ion("Sets highlight color"), _
System.Componen tModel.DefaultV alue(GetType(Co lor), "Red")_
Public Property HighlightBackGr oundColor() As Color
Get
Return mHighlightBackG roundColor
End Get
Set(ByVal value As Color)
mHighlightBackG roundColor = value
End Set
End Property

End Class