[HASAN6.0]

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Public Class OpaqueRichTextBox
   Inherits RichTextBox

   Private Shared ReadOnly DefaultBackground As Color = Color.Transparent
   Private TransparentImage As Image

   Public Sub New()
       Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
       Me.SetStyle(ControlStyles.Opaque, True)
       Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True)
       BackColor = DefaultBackground
   End Sub

   Public Overrides Property BackColor() As System.Drawing.Color
       Get
           Return MyBase.BackColor
       End Get
       Set(ByVal value As System.Drawing.Color)
           MyBase.BackColor = value
       End Set
   End Property

   Public Property Image() As Image
       Get
           Return TransparentImage
       End Get
       Set(ByVal value As Image)
           TransparentImage = value
           Invalidate()
       End Set
   End Property

   Protected Overrides ReadOnly Property CreateParams() As System.Windows.Forms.CreateParams
       Get
           Dim cp As CreateParams = MyBase.CreateParams
           cp.ExStyle = cp.ExStyle Or &H20
           Return cp
       End Get
   End Property

   ' Infrastructure to cause the default background to be transparent
   Public Function ShouldSerializeBackColor() As Boolean
       Return BackColor = DefaultBackground
   End Function

   ' Infrastructure to cause the default background to be transparent
   Public Sub ResetBackground()
       BackColor = DefaultBackground
   End Sub

End Class

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