wxASSERT_MSG( (!((num_rows > 0) && (num_cols <= 0)) ||
!((num_rows <= 0) && (num_cols > 0)) ||
!((num_rows == 0) && (num_cols == 0))),
wxASSERT_MSG( (!((num_rows > 0) && (num_cols <= 0)) ||
!((num_rows <= 0) && (num_cols > 0)) ||
!((num_rows == 0) && (num_cols == 0))),