Declaration
headerClickCallBack(c, data)
Parameters
- c (DayPilot.Column) - column header that was clicked
 - data (object) - additional custom data
 
DayPilot.Column is a simple object that has the following properties:
- start (DayPilot.Date) - column start date
 - name (string) - column name
 - value (string) - column value (id)