通过重写C#中的ComboBox类

				namespace CustomColoredComboBox
				{
				    partial class Form1
				    {
				        /// 
				        /// Required designer variable.
				        /// 
				        private System.ComponentModel.IContainer components = null;
				
				        /// 
				        /// Clean up any resources being used.
				        /// 
				        /// true if managed resources should be disposed; otherwise, false.
				        protected override void Dispose(bool disposing)
				        {
				            if (disposing && (components != null))
				            {
				                components.Dispose();
				            }
				            base.Dispose(disposing);
				        }
				
				        #region Windows Form Designer generated code
				
				        /// 
				        /// Required method for Designer support - do not modify
				        /// the contents of this method with the code editor.
				        /// 
				        private void InitializeComponent()
				        {
				            this.coloredComboBox1 = new CustomColoredComboBox.ColoredComboBox();
				            this.SuspendLayout();
				            // 
				            // coloredComboBox1
				            // 
				            this.coloredComboBox1.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
				            this.coloredComboBox1.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
				            this.coloredComboBox1.FormattingEnabled = true;
				            this.coloredComboBox1.Items.AddRange(new object[] {
				            "Black",
				            "Red",
				            "Blue",
				            "Green",
				            "Pink",
				            "DarkRed",
				            "Yellow",
				            "Orange"});
				            this.coloredComboBox1.Location = new System.Drawing.Point(12, 12);
				            this.coloredComboBox1.MyColors = new string[] {
				        "Black",
				        "Red",
				        "Blue",
				        "Green",
				        "Pink",
				        "DarkRed",
				        "Yellow",
				        "Orange",
				        "x"};
				            this.coloredComboBox1.Name = "coloredComboBox1";
				            this.coloredComboBox1.Size = new System.Drawing.Size(103, 21);
				            this.coloredComboBox1.TabIndex = 0;
				            this.coloredComboBox1.SelectedIndexChanged += new System.EventHandler(this.coloredComboBox1_SelectedIndexChanged);
				            // 
				            // Form1
				            // 
				            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
				            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
				            this.ClientSize = new System.Drawing.Size(242, 173);
				            this.Controls.Add(this.coloredComboBox1);
				            this.Name = "Form1";
				            this.Text = "Form1";
				            this.ResumeLayout(false);
				
				        }
				
				        #endregion
				
				        private ColoredComboBox coloredComboBox1;
				    }
				}