Specify the display size of Row hovering mask. It is used as DisplayOptions.rowHoverMask property.
| INDICATOR_AND_DATA | "indicatorAndData" | Display from RowIndicator to end of data area. |
| INDICATOR_AND_FILL | "indicatorAndFill" | Display from RowIndicator to end of grid area. |
| CHECK_AND_DATA | "checkAndData" | Display from CheckBar to end of data area. |
| CHECK_AND_FILL | "checkAndFill" | Display from CheckBar to end of grid area. |
| DATA | "data" | Display by adjusting to the size of data area. |
| FILL | "fill" | Display by adjusting to grid area. |
| CELL | "cell" | Display by adjusting to the size of data cell under the mouse. v 1.3.6 |