Moves a reference by the specified number of rows and columns
BOOL MoveBy( long nRows, long nCols );
Number of rows to move by (negative is up, positive is down).
Number of columns to move by (negative is left, positive is right).
Returns TRUE if the function was successful, FALSE if it failed. The function can fail if the resulting address would be out of range.
This method moves the CXlRef by the offsets provided. Left and Right will each be moved by nCols; Top and Bottom will each be moved by nRows. (Height and Width will be unaffected.)