Help with create user wizard.

Hi I used a create user wizard control in asp.net and then added a new row for date of birth.

I added a calender with id cal1 and textbox (with id txtdob ) for entering the selected date in textbox.

Now i used to foll code to enter to select date of birth from calender.

protected void cal1_SelectionChanged1(object sender, EventArgs e)

{

txtdob.Text = cal1.SelectedDate.ToShortDateString();

}

But getting error that txtdob and cal1 does not exist in current context.

i.e. i am unable to access custom control that i added in create user wizard.