I have set the following parameter:
HeaderClickHandling="JavaScript"
The 'standard' javascript is defined as:
alert('Header with id ' + c.value + ' clicked.')
The alert however, alwaysreturns null for c.value (Header with id null clicked. is the exact alert message)
I tried to change the 'c' for 'e' which sounds more appropriate to me. Unfortunately that only made things worse (e is not defined error).
The behaviour I want to achieve is that when multiple days are listed, clicking on a column will give me that single day full screen. But as long as I cannot get back the clicked date from the column, this appears very difficult to do :-)