HeaderRowType API in JavaScript (ES5) Schedule API control

An enum that holds the header row type in the timeline scheduler.

• Year - Denotes the year row in the header bar.
• Month - Denotes the month row in the header bar.
• Week - Denotes the week row in the header bar.
• Date - Denotes the date row in the header bar.
• Hour - Denotes the hour row in the header bar.