State used by the MultiColumnHeader.
This state object.
| columns | The array of column states used by the MultiColumnHeader class. | 
| maximumNumberOfSortedColumns | This property controls the maximum number of columns returned by the sortedColumns property. | 
| sortedColumnIndex | This property holds the index to the primary sorted column. | 
| sortedColumns | The array of column indices for multiple column sorting. | 
| visibleColumns | This is the array of currently visible column indices. | 
| widthOfAllVisibleColumns | Returns the sum of all the widths of the visible columns in the visibleColumns array. | 
| MultiColumnHeaderState | Constructor. | 
| CanOverwriteSerializedFields | Checks if the source state can transfer its serialized data to the destination state. | 
| OverwriteSerializedFields | Overwrites the seralized fields from the source state to the destination state. |