Parameters
- rowIndex
- Index of the top row in the cell range.
- colIndex
- Index of the left column in the cell range.
- rowCount
- Number of rows in the cell range.
- colCount
- Number of columns in the cell range.
Return Value
A reference to the object if it was successfully added to the collection, or null if the object could not be added to the collection (usually because it overlaps another cell range already in the collection).