Need an event of selection of asp:CalendarExtender

Hi All,

I am using a Calendar Extender in my form. Now I want to do after selecting the date from it. I don't find any event on server side for this control. below is my aspx code

<asp:TextBox ID="txtDate_From" runat="server" CssClass="link" Width="180px"  
                    ontextchanged="txtDate_From_TextChanged" Enabled="False"></asp:TextBox><asp:CalendarExtender ID="txtDate_From_CalendarExtender" Format="dd/MM/yyyy" runat="server"
                    Enabled="True" TargetControlID="txtDate_From" >

Could you please let me what I can do for my requirement?

Thanks