All the classes will be prefixed with the value of CssClassPrefix property.
"_message" will result in "month_green_message".
Close icon of the message bar.
Main event box.
A <div> inside event box (_event).
Added to the main event box when the cursor is on an event (in addition to _event).
A selected event (in addition to _event).
Events that start outside of the visible area.
Events that end outside of the visible area.
Moving/resizing shadow marker.
A <div> inside _shadow.
The topmost <div>.
Day header (Monday, Tuesday...) cell.
A <div> inside _header.
A <div> inside _cell.
A day cell in previous month (in addition to _cell).
A day cell in next month (in addition to _cell).
Day cell header (with day number).
Business time cells (defined as Monday - Friday). Used in addition to _cell.