how to know whether done button is clicked on primefaces calendar

[newbie2911]

I searched the entire web but not a single info found regarding this. Actually I need to whether there is a way to find out if the user has clicked Done button on the button panel of primefaces calender. I tried out Dateselect event and made a logic but that fails if the user just opens the widget and closed it.And also I tried upon isctrlkey and ismetakey but both are always false in all cases. is there any specific unique identifier that helps us to distinguish that the user has clicked the done button ? Pls pls pls some one help.