CPPointOfinterestTemplate : How to get the event for "X"/Close button

Hi,

I am using the CPPointOfinterestTemplate and wanted to change the trailingNavigationBarButtons when the user navigate to detail screen(This is done with the help of didSelectPointOfInterest delegate function). However i could not find any documentation on resetting the trailingNavigationBarButtons when the user click on the "X"/Close button on the details screen. Can you explain if there is any way i can handle my

CPPointOfinterestTemplate : How to get the event for "X"/Close button
 
 
Q