Confirm Deletion of Timesheet Line

We are on AX 2012 Feature Pack CU4.  We would like to add the standard confirm deletion of a record process to the timesheet lines in the timesheet entry form.  When trying to delete many different types of records throughout the system, a yes/no popup is generated with a standard message "You are about to delete a record in (record type, 'Customers', etc). Delete record?"  We would like this popup to ask for confirmation when a user clicks to delete a timesheet line.  Do I need to modify the validateDelete method of the TSTimesheetEntry form, or the TSTimesheetLine table, or make some other modification?  Any recommendations are much appreciated.

Thanks!