Remove calendarextender disabled month from the grid

I have an Ajax CalendarExtender with a startdate as follow in the page load event.

'Date From can only be starting from the current month
 CalendarExtender1.StartDate = DateTime.Now

And I override the default style with the following in my stylesheet.

.ajax__calendar .ajax__calendar_invalid
{
	visibility:hidden;
}

My calendar looks like this according to my StartDate parameter and CSS. I wish I could show my calendar as the second whenever a complete row of month is hidden according to my StartDate parameter. A complete row of Months to be removed from the grid.  Any idea how to achieve this?