// common) case when the number of rows was not specified in the ctor -- in
// this case it will be computed only later, when all items are added to
// the sizer, and the check will be done in AdjustForGrowables()
// common) case when the number of rows was not specified in the ctor -- in
// this case it will be computed only later, when all items are added to
// the sizer, and the check will be done in AdjustForGrowables()