using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Diagnostics;

 using System.Drawing;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace ComponentComposite

 {

     [ToolboxBitmap(typeof(Timer))]

     public partial class Component1:UserControl

     {

         private Color _colFColor;

         private Color _colBColor;

         public Color colFColor { get { return _colFColor; } set { _colFColor = value; checkBox1.ForeColor = _colFColor; } }

         public Color colBColor { get { return _colBColor; } set { _colBColor = value; checkBox1.BackColor = _colBColor; } }

         public Component1()

         {

             InitializeComponent();

         }

         public Component1(IContainer container)

         {

             container.Add(this);

             InitializeComponent();

         }

         private void timer1_Tick(object sender, EventArgs e)

         {   Random rdm=new Random();

             int i1=rdm.Next(,);int i2=rdm.Next(,);int i3=rdm.Next(,);

             button1.BackColor = System.Drawing.Color.FromArgb(i1, i2, i3);

         }

         private void checkBox1_CheckedChanged(object sender, EventArgs e)

         {

             timer1.Enabled = (timer1.Enabled)?false:true;

         }

     }

 }