property Column.Alignment as AlignmentEnum
Specifies the column's alignment.

AlignmentEnum An AlignmentEnum expression that specifies the alignment of the column's content. 
By default, the Alignment property is LeftAlignment. Use the Alignment property to change the column's alignment. The column's alignment is keep once you drag or group by that column. The HeaderAlignment property specifies the alignment of the caption in the column's header.