The location of check mark or icon which will be displayed in Column Header cell.
| NONE | "none" | Do not display. |
| LEFT_SIDE | "leftSide" | Adhere to the left side of header cell. |
| RIGHT_SIDE | "rightSide" | Adhere to the right side of header cell. |
| TOP_SIDE | "topSide" | Adhere to the top of header cell. |
| BOTTOM_SIDE | "bottomSide" | Adhere to the bottom of header cell. |
| LEFT | "left" | Display on the left side of text. |
| RIGHT | "right" | Display on the right side of text. |
| TOP | "top" | Display on the top of text. |
| BOTTOM | "bottom" | Display on the bottom of text. |
| CENTER | "center" | Display to the center. Do not display text. |