How to set the Windows XP like gradient background color in the WinForms XPTaskBar?

//Specifies the appearance of the XPTaskBar.
this.xpTaskBar1.Style = XPTaskBarStyle.Default;
//Draws the header portion of the XPTaskBarBox.
this.xpTaskBarBox1.ProvideHeaderBackgroundBrush += new ProvideBrushEventHandler(xpTaskBarBox1_ProvideHeaderBackgroundBrush);
//Customizes the appearance of the header of the XPTaskBarBox.
void xpTaskBarBox1_ProvideHeaderBackgroundBrush(object sender, ProvideBrushEventArgs args)
{
    // Blends settings.
    float[] relativeIntensities = { 0.0f, 0.0f, 1.0f };
    float[] relativePositions = { 0.0F, 0.5f, 1.0F };
    System.Drawing.Drawing2D.Blend blend = new System.Drawing.Drawing2D.Blend();
    blend.Factors = relativeIntensities;
    blend.Positions = relativePositions;
    XPTaskBarBox box = sender as XPTaskBarBox;
    // Header back brush.
    System.Drawing.Drawing2D.LinearGradientBrush lgBrush = new System.Drawing.Drawing2D.LinearGradientBrush(args.Bounds, Color.LightYellow, Color.SkyBlue, 0, true);
    lgBrush.Blend = blend;
    args.Brush = lgBrush;
}

'Specifies the appearance of the XPTaskBar.
Me.xpTaskBar1.Style = XPTaskBarStyle.Default
'Draws the header portion of the XPTaskBarBox. 
AddHandler xpTaskBarBox1.ProvideHeaderBackgroundBrush, AddressOf xpTaskBarBox1_ProvideHeaderBackgroundBrush
'Customizes the appearance of the header of the XPTaskBarBox.
Private Sub xpTaskBarBox1_ProvideHeaderBackgroundBrush(ByVal sender As Object, ByVal args As ProvideBrushEventArgs)
   'Blend settings.
   Dim relativeIntensities() As Single = { 0.0f, 0.0f, 1.0f }
   Dim relativePositions() As Single = { 0.0F, 0.5f, 1.0F }
   Dim blend As New System.Drawing.Drawing2D.Blend()
   blend.Factors = relativeIntensities
   blend.Positions = relativePositions
   Dim box As XPTaskBarBox = TryCast(sender, XPTaskBarBox)
   'Header back brush.
   Dim lgBrush As New System.Drawing.Drawing2D.LinearGradientBrush(args.Bounds, Color.LightYellow, Color.SkyBlue, 0, True)
   lgBrush.Blend = blend
   args.Brush = lgBrush
End Sub

//Draws the item area of the XPTaskBarBox.
this.xpTaskBarBox1.ProvideItemsBackgroundBrush += new ProvideBrushEventHandler(xpTaskBarBox1_ProvideItemsBackgroundBrush);
//Customizes the appearance of the item background in the XPTaskBarBox.
void xpTaskBarBox1_ProvideItemsBackgroundBrush(object sender, ProvideBrushEventArgs args)
{
   // Paint should be applied only when the Height is greater than zero.
   if(args.Bounds.Width != 0 && args.Bounds.Height != 0)
   {
      // Blends settings.
      float[] relativeIntensities = { 0.0f, 0.0f, 1.0f };
      float[] relativePositions = { 0.0F, 0.5f, 1.0F };
      System.Drawing.Drawing2D.Blend blend = new System.Drawing.Drawing2D.Blend();
      blend.Factors = relativeIntensities;
      blend.Positions = relativePositions;
      // Item back brush.
      System.Drawing.Drawing2D.LinearGradientBrush lgBrush = new System.Drawing.Drawing2D.LinearGradientBrush(args.Bounds, Color.CornflowerBlue, Color.Aqua, 0, true);
      lgBrush.Blend = blend;
      args.Brush = lgBrush;
   }
}

'Customizes the appearance of the item background in the XPTaskBarBox.
Private Sub xpTaskBarBox1_ProvideItemsBackgroundBrush(ByVal sender As Object, ByVal args As ProvideBrushEventArgs)
   'Paint should be applied only when the Height is greater than zero.
   If args.Bounds.Width <> 0 AndAlso args.Bounds.Height <> 0 Then
      'Blends settings.
      Dim relativeIntensities() As Single = { 0.0f, 0.0f, 1.0f }
      Dim relativePositions() As Single = { 0.0F, 0.5f, 1.0F }
      Dim blend As New System.Drawing.Drawing2D.Blend()
      blend.Factors = relativeIntensities
      blend.Positions = relativePositions
      'Item back brush.
      Dim lgBrush As New System.Drawing.Drawing2D.LinearGradientBrush(args.Bounds, Color.CornflowerBlue, Color.Aqua, 0, True)
       lgBrush.Blend = blend
       args.Brush = lgBrush
   End If
End Sub