Brh.Forms.PopupNotify.drawThemeCloseButton C# (CSharp) Method

        protected Bitmap drawThemeCloseButton(Int32 state)
        {
            Bitmap output = new Bitmap(closeButton.Width, closeButton.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
            Graphics fx = Graphics.FromImage(output);

            IntPtr hTheme = OpenThemeData (Handle, "Window");

            if (hTheme == IntPtr.Zero)
            {
                fx.Dispose();
                return drawLegacyCloseButton (state);
            }

            Rectangle rClose = new Rectangle(0, 0, closeButton.Width, closeButton.Height);
            RECT reClose = rClose;
            RECT reClip = reClose; // should fx.VisibleClipBounds be used here?
            IntPtr hDC = fx.GetHdc();
            DrawThemeBackground (hTheme, hDC, WP_CLOSEBUTTON, state, ref reClose, ref reClip);
            fx.ReleaseHdc (hDC);
            fx.DrawImage(output,rClose);
            CloseThemeData (hTheme);
            fx.Dispose();

            return output;
        }