Problem with Calender Extender Control in Ajax tool kit

hello guys how r u ?

my Question is that,

i am working with Ajax tool kit Calender Extender Control i am getting single date formate in textbox like 07/06/2011
but
i want like this in my textbox "7/6/2011, 7/15/2011" means i want 2 dates or more then this in one textbox with calender extender control

so how can i do like this  please help

Reply soon  its urgent

Thanks.