System.Windows.Forms.ThemeWin32Classic.DrawCaptionHelper C# (CSharp) Method

		private void DrawCaptionHelper(Graphics graphics, Color color, Pen pen, int lineWidth, int shift, Rectangle captionRect, CaptionButton button) {
			switch(button) {
			case CaptionButton.Close: {
				if (lineWidth<2) {
					graphics.DrawLine(pen, captionRect.Left+2*lineWidth+1+shift, captionRect.Top+2*lineWidth+shift, captionRect.Right-2*lineWidth+1+shift, captionRect.Bottom-2*lineWidth+shift);
					graphics.DrawLine(pen, captionRect.Right-2*lineWidth+1+shift, captionRect.Top+2*lineWidth+shift, captionRect.Left+2*lineWidth+1+shift, captionRect.Bottom-2*lineWidth+shift);
				}

				graphics.DrawLine(pen, captionRect.Left+2*lineWidth+shift, captionRect.Top+2*lineWidth+shift, captionRect.Right-2*lineWidth+shift, captionRect.Bottom-2*lineWidth+shift);
				graphics.DrawLine(pen, captionRect.Right-2*lineWidth+shift, captionRect.Top+2*lineWidth+shift, captionRect.Left+2*lineWidth+shift, captionRect.Bottom-2*lineWidth+shift);
				return;
			}

			case CaptionButton.Help: {
				StringFormat	sf = new StringFormat();				
				Font				font = new Font("Microsoft Sans Serif", captionRect.Height, FontStyle.Bold, GraphicsUnit.Pixel);

				sf.Alignment=StringAlignment.Center;
				sf.LineAlignment=StringAlignment.Center;


				graphics.DrawString("?", font, ResPool.GetSolidBrush (color), captionRect.X+captionRect.Width/2+shift, captionRect.Y+captionRect.Height/2+shift+lineWidth/2, sf);

				sf.Dispose();				
				font.Dispose();

				return;
			}

			case CaptionButton.Maximize: {
				/* Top 'caption bar' line */
				for (int i=0; i<Math.Max(2, lineWidth); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift, captionRect.Top+2*lineWidth+shift+i, captionRect.Right-lineWidth-lineWidth/2+shift, captionRect.Top+2*lineWidth+shift+i);
				}

				/* Left side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift+i, captionRect.Top+2*lineWidth+shift, captionRect.Left+lineWidth+shift+i, captionRect.Bottom-lineWidth+shift);
				}

				/* Right side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Right-lineWidth-lineWidth/2+shift+i, captionRect.Top+2*lineWidth+shift, captionRect.Right-lineWidth-lineWidth/2+shift+i, captionRect.Bottom-lineWidth+shift);
				}

				/* Bottom line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift, captionRect.Bottom-lineWidth+shift-i, captionRect.Right-lineWidth-lineWidth/2+shift, captionRect.Bottom-lineWidth+shift-i);
				}
				return;
			}

			case CaptionButton.Minimize: {
				/* Bottom line */
				for (int i=0; i<Math.Max(2, lineWidth); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift, captionRect.Bottom-lineWidth+shift-i, captionRect.Right-3*lineWidth+shift, captionRect.Bottom-lineWidth+shift-i);
				}
				return;
			}

			case CaptionButton.Restore: {
				/** First 'window' **/
				/* Top 'caption bar' line */
				for (int i=0; i<Math.Max(2, lineWidth); i++) {
					graphics.DrawLine(pen, captionRect.Left+3*lineWidth+shift, captionRect.Top+2*lineWidth+shift-i, captionRect.Right-lineWidth-lineWidth/2+shift, captionRect.Top+2*lineWidth+shift-i);
				}

				/* Left side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Left+3*lineWidth+shift+i, captionRect.Top+2*lineWidth+shift, captionRect.Left+3*lineWidth+shift+i, captionRect.Top+4*lineWidth+shift);
				}

				/* Right side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Right-lineWidth-lineWidth/2+shift-i, captionRect.Top+2*lineWidth+shift, captionRect.Right-lineWidth-lineWidth/2+shift-i, captionRect.Top+5*lineWidth-lineWidth/2+shift);
				}

				/* Bottom line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Right-3*lineWidth-lineWidth/2+shift, captionRect.Top+5*lineWidth-lineWidth/2+shift+1+i, captionRect.Right-lineWidth-lineWidth/2+shift, captionRect.Top+5*lineWidth-lineWidth/2+shift+1+i);
				}

				/** Second 'window' **/
				/* Top 'caption bar' line */
				for (int i=0; i<Math.Max(2, lineWidth); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift, captionRect.Top+4*lineWidth+shift+1-i, captionRect.Right-3*lineWidth-lineWidth/2+shift, captionRect.Top+4*lineWidth+shift+1-i);
				}

				/* Left side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift+i, captionRect.Top+4*lineWidth+shift+1, captionRect.Left+lineWidth+shift+i, captionRect.Bottom-lineWidth+shift);
				}

				/* Right side line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Right-3*lineWidth-lineWidth/2+shift-i, captionRect.Top+4*lineWidth+shift+1, captionRect.Right-3*lineWidth-lineWidth/2+shift-i, captionRect.Bottom-lineWidth+shift);
				}

				/* Bottom line */
				for (int i=0; i<Math.Max(1, lineWidth/2); i++) {
					graphics.DrawLine(pen, captionRect.Left+lineWidth+shift, captionRect.Bottom-lineWidth+shift-i, captionRect.Right-3*lineWidth-lineWidth/2+shift, captionRect.Bottom-lineWidth+shift-i);
				}

				return;
			}

			}
		}