Parameters
- grid
- C1FlexGrid that contains the merged cell.
- cellType
- CellType that specifies the type of the merged cell.
- rng
- A CellRange that specifies the coordinates of the cell to be merged.
The GetMergedRange method must fulfill two requirements:
1) The range returned must always contain the range passed in as a parameter.
2) The range returned must be the same for any cell contained in it.