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[DllImport("dwmapi.dll", PreserveSig = false)]
private static extern bool DwmIsCompositionEnabled();

      public static bool IsAeroEnabled {
         get {
            try {
               return DwmIsCompositionEnabled();
            }catch(Exception e) {
               return false;
            }
         }
      }

[DllImport("dwmapi.dll", PreserveSig = false)]
private static extern void DwmGetColorizationColor(out int pcrColorization, [MarshalAs(UnmanagedType.Bool)]out bool pfOpaqueBlend);

try {
   int argb;
   bool opaque;
   DwmGetColorizationColor(out argb, out opaque);
 
   return Color.FromArgb(argb);
} catch (Exception) {
   // Fehler beim Lesen der Farben, tritt meistens dann auf,
   // wenn man Zwischen Aero und dem Basic Theme hin und her wechselt oder
   // Aero nicht aktiviert war.
}

[DllImport("dwmapi.dll", PreserveSig = false)]
private static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref MARGINS margins);

[StructLayout(LayoutKind.Sequential)]
public struct MARGINS {
	public MARGINS(int left, int right, int top, int bottom) {
		this.CXLeftWidth = left;
		this.CXRightWidth = right;
		this.CYBottomHeight = bottom;
		this.CYTopHeight = top;
	}
	public int CXLeftWidth;
	public int CXRightWidth;
	public int CYTopHeight;
	public int CYBottomHeight;
 
	public override int GetHashCode() {
		return base.GetHashCode();
	}
 
	public override bool Equals(object obj) {
		return base.Equals(obj);
	}
 
	public static bool operator ==(MARGINS x, MARGINS y) {
		if ((x.CXLeftWidth == y.CXLeftWidth)
			&& (x.CXRightWidth == y.CXRightWidth)
			&& (x.CYBottomHeight == y.CYBottomHeight)
			&& (x.CYTopHeight == y.CYTopHeight))
				return true;
 
		return false;
	}
 
	public static bool operator !=(MARGINS x, MARGINS y) {
		if ((x.CXLeftWidth == y.CXLeftWidth)
			&& (x.CXRightWidth == y.CXRightWidth)
			&& (x.CYBottomHeight == y.CYBottomHeight)
			&& (x.CYTopHeight == y.CYTopHeight))
				return false;
 
		return true;
	}
}

      public static void ExtendGlass(IntPtr hwnd, MARGINS margins) {
         try {
            int result = DwmExtendFrameIntoClientArea(hwnd, ref margins);
         } catch (Exception e) {
            // ...
         }
      }

if (Aero.IsAeroEnabled) {
   Aero.ExtendGlass(this.Handle,
      new Aero.MARGINS(0, 0, 33, this.Width));
}

protected override  void OnPaintBackground(PaintEventArgs e)
{
      base.OnPaint(e);
      if (Aero.IsAeroEnabled)
      {
         e.Graphics.Clear(Color.Black);
         Rectangle clientArea = new Rectangle(
            0, 0, this.Width, 33
         );
         Brush b = new SolidBrush(this.BackColor);
         e.Graphics.FillRectangle(b, clientArea);
      }
}