Calender as drop down list

Can anybody tell me the meaning of

ew:CalendarPopup ID="ucCalendar" runat="server" Width="80px" ImageUrl="~/images/calendar.gif"
                                    ControlDisplay="LabelImage" ShowGoToTo开发者_开发百科day="True" CalendarLocation="Bottom" UseExternalResource="True"
                                    ExternalResourcePath="~/Include/JS/Calendar/eWorld_UI_CalendarPopup.js" Nullable="True"
                                    ToolTip="Select meeting date">
                                    <WeekdayStyle Font-Size="XX-Small" Font-Names="Verdana,Helvetica,Tahoma,Arial" ForeColor="Black"
                                        BackColor="White"></WeekdayStyle>

Pls its urgent

It uses a server control called CalendarPopup declared by the ew TagPrefix in the @Register directive or in web.config. It also initializes some of its properties.