请问如何设置DataGrid的某个列头的背景色(winForm)

public class DataGridColoredTextBoxColumn : DataGridTextBoxColumn 
       { 
            protected override void Paint(System.Drawing.Graphics g, 
                 System.Drawing.Rectangle bounds, System.Windows.Forms.CurrencyManager 
                 source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush 
                 foreBrush, bool alignToRight) 
            { 
            // the idea is to conditionally set the foreBrush and/or backbrush 
            // depending upon some crireria on the cell value 
            // Here, we color anything that begins with a letter higher than 'F' 
                 try{ 
                      object o = this.GetColumnValueAtRow(source, rowNum); 
                      if( o!= null) 
                      { 
                           char c = ((string)o)[0]; 
                           if( c > 'F') 
                           { 
                           // could be as simple as 
                           // backBrush = new SolidBrush(Color.Pink); 
                           // or something fancier... 
                                backBrush = new LinearGradientBrush(bounds, 
                                     Color.FromArgb(255, 200, 200), 
                                     Color.FromArgb(128, 20, 20), 
                                     LinearGradientMode.BackwardDiagonal); 
                                foreBrush = new SolidBrush(Color.White); 
                           } 
                      } 
                 } 
                  catch(Exception ex){ /* empty catch */ } 
                 finally{ 
                      // make sure the base class gets called to do the drawing with 
                      // the possibly changed brushes 
                      base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight); 
                 } 
            } 
       } 
 
http://www.syncfusion.com/faq/winforms/Files/datagridcoloredcells.zip
http://www.syncfusion.com/faq/winforms/Files/datagridcellxcellenable.zip