Extender control CalendarExtender1 cannot extend DropDownList1

there is no problem when i try to extend the Calendar extender to the text box it is running fine, but

the Exception is :'AjaxControlToolkit.CalendarExtender' cannot extend controls of type 'System.Web.UI.WebControls.DropDownList',

im getting this Exception when i try to extend Ajax-calender Extender conrtol to dropdownlist,i have assigned the dropdown list control in the targetcontrolid of the Calender extender and set the dateformat and popup control id ,is ther any other thing i should do get this right,

Prakash,

Telesoft India ,Bangalore.

that is because the calendar extendar is designed to work with a textbox. If you really want the result in a drop down list you could try putting a textbox on your field and making it hidden. Then attach the calendar extender to that hidden textbox and when the user clicks a date, assign the drop down list to the value of the textbox