public class Class1 : CompositeControl, INamingContainer
{
private Calendar calendar1;
private LinkButton linkbutton1;
private TextBox textbox1;
private Image image1;
public Class1()
{
calendar1 = new Calendar();
linkbutton1 = new LinkButton();
textbox1 = new TextBox();
image1 = new Image();
calendar1.SelectionChanged += new EventHandler(calendar1_SelectionChanged);
linkbutton1.Click += new EventHandler(linkbutton1_Click);
calendar1.ID = "cal1";
calendar1.Enabled = false;
linkbutton1.ID = "lb1";
linkbutton1.Text = "click me";
textbox1.ID = "tb1";
image1.ID = "img1";
image1.ImageUrl = "~/foo.jpg";
}

protected void calendar1_SelectionChanged(Object o, EventArgs e)
{
textbox1.Text = calendar1.SelectedDate.ToShortDateString();
linkbutton1.Visible = true;
textbox1.Visible = true;
calendar1.Enabled = false;
}

protected void linkbutton1_Click(Object o, EventArgs e)
{
linkbutton1.Visible = false;
textbox1.Visible = false;
calendar1.Enabled = true;
}

protected override void CreateChildControls()
{
if (!this.ChildControlsCreated)
{
this.Controls.Add(calendar1);
this.Controls.Add(image1);
this.Controls.Add(textbox1);
this.Controls.Add(linkbutton1);
}
base.CreateChildControls();
}

protected override void Render(HtmlTextWriter writer)
{
writer.Write("Begin control");
base.Render(writer);
writer.Write("End control");
}
}
</code>

Thanks,
Kashif

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace BP.Legal.LDT.WebControls
{
	/// 
	/// Summary description for TextBoxCalendar.
	/// 
	[DefaultProperty("Text"), 
	ToolboxData("<{0}:TextBoxCalendar runat=server>")]
	public class TextBoxCalendar : System.Web.UI.WebControls.WebControl, System.Web.UI.INamingContainer
	{
		protected System.Web.UI.WebControls.TextBox DateTextBox = new TextBox();
		protected System.Web.UI.WebControls.LinkButton CalendarButton = new LinkButton();
		protected System.Web.UI.WebControls.Image CalendarIcon = new Image();
		protected System.Web.UI.WebControls.Calendar Calendar1 = new Calendar();
		protected System.Web.UI.WebControls.CompareValidator DateCompareValidator = new CompareValidator();
		private DateTime date;

		[Bindable(true), 
		Category("Appearance"), 
		DefaultValue("")]
		public DateTime DefaultDate
		{
			get { return this.date; }
			set { this.date = value; }
		}

		[Bindable(true), 
		Category("Appearance"), 
		DefaultValue("")]
		public string TextBoxCssClass
		{
			get 
			{ 
				return this.DateTextBox.CssClass;
			}
			set 
			{
				this.EnsureChildControls();
				this.DateTextBox.CssClass = value;
			}
		}

		[Bindable(true), 
		Category("Appearance"), 
		DefaultValue("")]
		public string ButtonCssClass
		{
			get 
			{ 
				return this.CalendarButton.CssClass;
			}
			set 
			{ 
				this.EnsureChildControls();
				this.CalendarButton.CssClass = value;
			}
		}

		///  
		/// Render this control to the output parameter specified.
		/// 
		///  The HTML writer to write out to 
		protected override void Render(HtmlTextWriter output)
		{
			this.DateTextBox.RenderControl(output);
			this.CalendarButton.RenderControl(output);
			this.DateCompareValidator.RenderControl(output);
			this.Calendar1.RenderControl(output);
		}

		protected override void CreateChildControls()
		{
			base.CreateChildControls ();

			this.DateTextBox.ID = "DateTextBox";
			this.Controls.Add(this.DateTextBox);
			
			this.CalendarButton.ID = "CalendarButton";
			this.CalendarButton.Click += new EventHandler(CalendarButton_Click);
			this.Controls.Add(this.CalendarButton);
			
			this.CalendarButton.Controls.Add(this.CalendarIcon);

			this.Calendar1.ID = "Calendar1";
			this.Calendar1.SelectionChanged += new EventHandler(Calendar1_SelectionChanged);
			this.Controls.Add(this.Calendar1);

			this.DateCompareValidator.ID = "DateCompareValidator";
			this.DateCompareValidator.ControlToValidate = this.DateTextBox.ID;
			this.DateCompareValidator.Display = ValidatorDisplay.Dynamic;
			this.DateCompareValidator.ErrorMessage = "Error message goes here.";
			this.DateCompareValidator.Operator = ValidationCompareOperator.DataTypeCheck;
			this.DateCompareValidator.Type = System.Web.UI.WebControls.ValidationDataType.Date;
			this.Controls.Add(this.DateCompareValidator);
		}

		private void Calendar1_SelectionChanged(object sender, EventArgs e)
		{
			this.date = this.Calendar1.SelectedDate;

			this.DateTextBox.Text = this.date.ToShortDateString();

			this.Calendar1.Visible = false;
			this.DateTextBox.Visible = true;
			this.CalendarButton.Visible = true;
			this.DateCompareValidator.Visible = true;
		}

		protected override void OnLoad(EventArgs e)
		{
			base.OnLoad (e);

			this.EnsureChildControls();

			if (! this.Page.IsPostBack)
			{
				this.DateTextBox.Visible = true;
				if (this.date != DateTime.MinValue)
					this.DateTextBox.Text = this.date.ToShortDateString();

				this.CalendarButton.Visible = true;
				this.Calendar1.Visible = false;
				this.DateCompareValidator.Visible = true;
			}
		}

		protected override void OnPreRender(EventArgs e)
		{
			base.OnPreRender (e);

			this.CalendarIcon.ImageUrl = this.Page.Request.ApplicationPath + System.Configuration.ConfigurationSettings.AppSettings["calendarIcon"];
		}

		private void CalendarButton_Click(object sender, EventArgs e)
		{
			if (! Page.IsValid)
				return;
			
			if (this.DateTextBox.Text == null || this.DateTextBox.Text == string.Empty)
				this.date = DateTime.Today;
			else
				this.date = DateTime.Parse(this.DateTextBox.Text);				

			this.Calendar1.SelectedDate = this.date;
			this.Calendar1.VisibleDate = this.date;

			this.DateTextBox.Visible = false;
			this.DateCompareValidator.Visible = false;
			this.CalendarButton.Visible = false;
			this.Calendar1.Visible = true;
			this.Page.Response.Write(this.Calendar1.ID);
		}
	}
}